Red Light Therapy Wavelengths Benefits: The Ultimate Guide

So one of the most common questions I get - and others at Light Therapy Insiders - is what the effects of different red light therapy wavelengths are. I therefore decided to create a blog post on this topic, pulling data from previous guides on different wavelengths.

These previous guides are:

Unfortunately, I've not yet been able to complete all guides on all important wavelengths, such as 630nm, 670nm, 760 potentially, and some in the 900s. Nevertheless, many of the most important wavelengths are included here and should tell you about the health benefits they confer on you.

I've only included the human studies in this process, on any topic, whereby 65% of studies or more have a positive outcome. There are huge downsides to this method that I will cover in the later section of this blog. But without further ado, here's the best evidence based on human studies of what different wavelengths do for your health:

Red Light Therapy Wavelength Benefits: What Do 660nm, 808 & 810nm, 830nm, And 850nm Do?

So here are all the red light therapy wavelength effects, depending on tissue and/or health conditions or health goal.

I've taken all this data from the Excel Sheet of the great Vladimir Heiskanen. That was an extremely time-intensive job but very well worth it.

For each study, I list the number of the study from the respective wavelength cheatsheet, the wavelength, whether it's a human study or not, and whether the study was positive. You'll see what I mean below.

Here you go:

Bone Health Benefits

Bone, Osteoporosis - 1064nm - (9, 1064, human RCT, negative), (10, 1064, human RCT, positive), (11, 1064 vs 633+904, human, positive).

Brain Health Benefits

Brain, Alzheimer's Disease - 808 & 810nm - (65, 800-820, neutral, human RCT), (66, 810, positive, human), (67, 808 vs 1064 vs 808+1064, positive, in vitro), (68, 808, positive, in vitro), (69, 808, positive, animal), (70, 810, positive, human), (71, 630+680+810, positive, animal), (72, 630+810, positive, human), (73, 810, positive human RCT), (74, 810, positive, human), (74, 808, positive, animal), (75, 808, positive, animal), (76, 808, positive, animal).

Brain, Cognitive performance - 1064nm - (17, 852 vs 1064, human RCT, positive), (18, 1064, human RCT, positive), (19, 1064, animal, neutral), (20, 1064, human, positive), (21, 1064, human, positive), (22, 1064, human, positive), (23, 1064, human RCT, positive), (24, 1064, human RCT, positive), (25, 1064, human RCT, positive).

Brain, Depression - 808 & 810nm - (100, 810, positive, animal), (101, 810, positive, animal), (102, 810+830, positive, human), (103, 810+980, positive, human), (104, 808, positive, animal), (105, 630 vs 810, positive, animal), (106, 810, positive, animal), (108, 810, positive, human RCT).

Brain, EEG - 1064nm - (27, 1064, human RCT, positive), (28, 1064, human RCT, positive), (29, 1064, human RCT, positive), (30, 1064, human RCT, positive), (31, 1064, human, positive).

Brain, Functional connectivity - 1064nm - (32, 1064, human RCT, positive), (33, 1064, human RCT, positive), (34, 1064, human RCT, positive).

Brain, Injury - 808 & 810nm - (80, 810, positive, human RCT), (81, 808, animal, positive), (82, 808, positive, animal), (83, 810, positive, animal), (84, 810, positive, animal), (85, 810+980 vs 810, positive, human), (86, 810+980, positive, human), (87, 810, positive, animal), (88, 810, positive, animal), (89, 808, positive, animal), (90, 810, positive, animal), (91, 808, positive, animal).

Brain, Injury - 850nm - (14, 810 vs 850 vs 870, positive, human), (15, 629+850, positive, human), (16, 850, positive, human).

Brain, Opioid Addiction - 808 & 810nm - (59, 810, positive, human RCT), (60, 810, positive, human RCT), (61, 810, positive, human RCT).

Brain, Stroke (Clinical) - 660nm - (39, 630+660+850, human, positive), (40, 660+808+980, human, positive), (41, 660+850, human, positive).

Carpal Tunnel Benefits

Carpal Tunnel, Carpal Tunnel Syndrome - 808 & 810nm - (153, 808 vs 860, positive, human RCT), (154, 780-830, neutral, human RCT), (155, 810, positive, human RCT).

Circulatory Benefits

Circulation, Arterial Retenosis - 808 & 810nm - (185, 808, positive, human RCT), (186, 808, positive, human RCT), (187, 808, positive, human RCT), (188, 808, positive, human RCT), (189, 808, positive, human), (190, 808, positive, human).

Dermatology Benefits

Dermatology, Acne Vulgaris - 660nm - (116, 660 vs 830, human RCT, positive), (117, 420+660, human RCT, positive), (118, 415 vs 415+660 vs white, human RCT, positive).

Dermatology, Herpes Labialis - 660nm - (123, 660, human, positive), (124, 660, human, positive), (125, 660, human, positive), (126, 660, human, positive), (127, 660, human, positive).

Dermatology, Herpes Zoster - 830nm - (138, 830, positive, human RCT), (139, 830, positive, human), (140, 830, positive, human RCT), (140, 830, positive, human), (141, 830, positive, human), (142, 830, positive, human), (143, 830, positive, human).

Dermatology, Radiation Dermatitis - 808 & 810nm - (210, 808+905, positive, human RCT), (211, 808+905, positive, human RCT), (212, 660+805, positive, human), (213, 808+905, positive, human).

Dermatology, Skin Rejuvenation - 660nm - (136, 590+660, human, positive), (137, 440+660+780, human RCT, positive), (138, 660+850, human, positive), (139, 660, in vitro, positive), (140, 660 vs 411-777, human RCT, positive), (141, 660, human, positive), (904, 658, human RCT, negative).

Dermatology, Skin Rejuvenation - 830nm - (157, 640+830, positive, in vitro), (158, 633+830, positive, human), (159, 633+830, positive, human), (160, 633 vs 830 vs 633+830, positive, human RCT), (161, 633+830, positive, human).

Eye Health Benefits

Eyes, Age-Related Macular Degeneration - 660nm - (158, 590+660+850, human, positive), (159, 590+660+850, human RCT, positive), (160, 660, in vitro, positive), (161, 590+660+850, human RCT, positive).

Eyes, Age-related Macular Degeneration - 850nm - (43, 590+660+850, positive, human), (44, 590+660+850, positive, human RCT), (45, 590+660+850, positive, human RCT).

Hair Growth And Health Benefits

Hair, Androgenetic Alopecia - 660nm - (179, 660+808, human RCT, positive), (180, 660, human, positive), (181, 660, human, negative), (182, 650+660, human RCT, positive), (183, 630+650+660, human RCT, positive), (901, 665 vs 665+808, human RCT, positive).

Infection Counteraction Benefits

Infections, COVID-19 - 660nm - (215, 660, animal, positive), (216, 660 vs 660+808, human, positive), (217, 660, human, positive), (218, 660, human RCT, positive), (219, 660, human, neutral), (220, 660, human, positive), (221, 630+660, human, positive), (222, 660, human, positive).

Infections, COVID-19 - 808 & 810nm - (264, 805+905, positive, human RCT), (265, 808+905, positive, human), (266, 808+905, positive, human).

Infections, COVID-19 - 850nm - (58, 633+850+905, positive, human), (59, 650+850, positive, human), (60, 633+850+905, neutral, human RCT).

Joint Benefits

Joints, Osteoarthritis - 660nm - (229, 660+808, human RCT, positive), (906, 658+810, human RCT, positive), (907, 405+658+810, human, neutral).

Joints, Osteoarthritis - 1064nm - (66, 1064, human RCT, negative), (67, 830 vs 1064, human RCT, positive), (68, 1064, human RCT, positive).

Joints, Osteoarthritis (Knee) - 830nm - (222, 830, positive, animal), (223, 830, positive, animal), (224, 830 vs 1064, positive, human RCT), (225, 830, positive, animal), (226, 830, positive, human RCT), (227, 830, positive, human RCT), (228, 830, negative, human RCT), (229, 830, neutral, human RCT), (230, 633+830, positive, human RCT), (231, 830, positive, human).

Joints, Osteoarthritis (knee) - 1064nm - (69, 1064, human, positive), (70, 1064, human RCT, positive), (71, 1064, human RCT, positive), (72, 830 vs 1064, human RCT, positive), (73, 1064, animal, positive).

Joints, Rheumatoid Arthritis - 830nm - (232, 830, positive, animal), (233, 830, positive, animal), (234, 830, positive, human RCT), (235, 830, negative, human), (236, 830, positive, human).

Mechanisms Research (Included For Completeness' Sake)

Mechanisms, Original research - 1064nm - (76, 380 vs 450 vs 530 vs 650 vs 808 vs 1064, in vitro, positive), (77, 800 vs 810 vs 850 vs 1064, human RCT, positive), (78, 660 vs 808 vs 1064, in vitro, positive), (79, 1064, human, positive), (80, 1064, human, positive), (81, 1064, human, positive).

Muscle Benefits

Muscle, Exercise-Related Health Improvements - 808 & 810nm - (364, 808, positive, human RCT), (365, 808, positive, human RCT), (366, 808, neutral, human RCT).

Muscle, Spasticity - 808 & 810nm - (382, 808, neutral, human), (383, 808, positive, human), (384, 808, positive, human).

Muscle, Sports Injuries - 830nm - (283, 830, positive, human), (284, 830, positive, human), (285, 830, positive, human).

Muscle, CNS: Bell's Palsy - 830nm - (286, 830 or 850, positive, human), (287, 830, positive, human), (288, 830, positive, human RCT), (289, 830 vs 1064, positive, human RCT), (290, 830, positive, human), (291, 830, neutral, human).

Nervous System Benefits

Nervous System, CNS: Bell's Palsy - 808 & 810nm - (386, 808+905, positive, human RCT), (386, 808, positive, human), (387, 810, neutral, human RCT), (388, 808, positive, human), (389, 660+808, positive, human), (390, 808, positive, human).

Nervous System, Diabetic Neuropathy - 660nm - (305, 633+660+850, human, positive), (306, 660, human RCT, positive), (307, 633+660+850, human, positive), (308, 660, animal, positive), (309, 633+660+850, human, positive).

Nervous System, Diabetic Neuropathy - 850nm - (129, 633+660+850, positive, human), (130, 633+660+850, positive, human), (131, 633+660+850, positive, human), (132, 850, positive, human RCT), (133, 780 vs 850, positive, animal),

Oral Health Benefits

Oral, Aphthous Stomatitis - 660nm - (372, 660, human RCT, positive), (373, 660 vs 10600, human RCT, negative), (373, 660, human RCT, positive), (374, 660, in vitro, neutral), (375, 660, human, positive), (912, 658, human RCT, positive).

Oral, Aphthous Stomatitis - 808 & 810nm - (447, 810, positive, human RCT), (448, 810, neutral, human), (449, 809, positive, human RCT).

Oral, Burning Mouth Syndrome - 660nm - (381, 660-970, human RCT, positive), (382, 660, human RCT, positive), (383, 660, human, positive), (384, 660, human, positive).

Oral, Dentin Hypersensitivity - 660nm - (400, 660+1064+1340, human, positive), (401, 660+810, human RCT, positive), (402, 660+808, animal, positive), (403, 660, human RCT, positive), (404, 660, human RCT, positive), (405, 660, in vitro, positive), (406, 660, human RCT, positive), (407, 630 vs 660, human RCT, positive), (408, 660, human RCT, neutral), (409, 660+830, human, positive), (410, 660, human, positive).

Oral, Dentin Hypersensitivity - 808 & 810nm - (480, 808, positive, human RCT), (481, 808, positive, human), (482, 660+810, positive, human RCT), (483, 660 vs 808, positive, animal), (484, 808, positive, human RCT), (485, 810, neutral, human RCT), (486, 808, positive, human RCT), (487, 810 vs 1,064, positive, human RCT), (488, 808, positive, human), (489, 810, positive, human RCT), (490, 810, positive, human RCT), (491, 810, positive, human RCT), (492, 810, positive, human), (493, 810+2,780, positive, human RCT), (494, 810, positive, human RCT), (495, 808, positive, human RTC), (496, 810, positive, human RCT).

Oral, Dentin hypersensitivity - 1064nm - (93, 660 vs 1064 vs 1340, human, positive), (94, 810 vs 1064, human, positive), (95, 1064, human RCT, positive), (96, 633 vs 633+1064, human RCT, positive).

Oral, Dry Mouth (Xerostomia / Hyposalivation) - 660nm - (411, 660+808, human, positive), (412, 660+810, human RCT, negative), (413, 660+780, human, positive), (414, 660+780, human, positive), (415, 660, human, positive).

Oral, Endodontics: Postoperative Symptoms - 808 & 810nm - (508, 660+808, negative, human RCT), (509, 808, positive, human RCT), (510, 808, positive, human RCT), (511, 808, positive, human RCT), (512, 808, neutral, human RCT), (513, 809, positive, human RCT).

Oral, Graft-Versus-Host Disease - 660nm - (450, 660, human, positive), (451, 660, human, positive), (452, 660, human, positive), (453, 660+810+850, human, positive), (454, 660 vs 660+850, human, positive).

Oral, Lichen Planus - 660nm - (457, 660, human RCT, negative), (458, 660, human RCT, positive), (459, 660, human RCT, positive), (460, 660, human RCT, positive).

Oral, Mastication - 808 & 810nm - (529, 808, positive, human), (530, 808, positive, human), (531, 810, neutral, human RCT).

Oral, Nerves: Inferior Alveolar - 808 & 810nm - (535, 808, positive, human RCT), (536, 808, positive, human), (537, 810, positive, human), (538, 810, positive, human), (539, 808, neutral, human), (540, 810 vs 980, positive, animal), (541, 660+808, positive, human), (542, 660+808, neutral, animal), (543, 660+810, positive, human RCT), (544, 810, positive, human RCT), (545, 632+810, neutral, human RTC), (546, 810, positive, human RCT).

Oral, Nerves: Inferior Alveolar - 830nm - (351, 830, negative, human RCT), (352, 820-830, positive, human), (353, 820-830, positive, animal), (354, 820-830, positive, human), (355, 830, positive, human).

Oral, Oral Mucositis - 660nm - (474, 660, human, positive), (475, 660, human RCT, negative), (476, 660, animal, positive), (477, 660+780, animal, positive), (478, 660+780, animal, positive), (479, 660 vs 810 vs 660+810, human RCT, positive), (480, 660, animal, positive), (481, 468 vs 660, human, positive), (482, 660+850, human RCT, positive), (483, 660+810+980, human RCT, positive), (484, 660, human, neutral), (485, 660, human RCT, positive), (486, 660, human, positive), (487, 660, human RCT, positive), (488, 660, human RCT, neutral), (489, 660, human, positive), (490, 660, human RCT, positive), (491, 660, human, positive), (492, 660, human, positive), (493, 660, human, neutral), (494, 660, human RCT, neutral), (495, 660, human, positive), (496, 660, human, positive), (497, 660 vs 810+980, animal, positive), (498, 660, human, positive), (499, 970 vs 660+800+970, human+in vitro, positive), (500, 660+808, human, positive), (501, 660+808, human RCT, positive), (502, 660+808, human RCT, positive), (503, 660, human RCT, positive), (504, 660+970, human RCT, positive), (505, 660, human, positive), (506, 660, human, positive), (507, 660, human, positive), (508, 660, human RCT, positive), (509, 660, human, positive), (510, 660, human, positive), (511, 660, human RCT, positive), (512, 660, animal, positive), (513, 660+ 808, human, positive), (514, 660+850, human, positive), (515, 660, human, positive), (516, 660, human, positive), (517, 635+808+660, animal, positive), (518, 660, human RCT, positive), (519, 660 vs 810 vs 980 vs 1064, animal, positive), (520, 660, human RCT, positive), (521, 660, human RCT, positive), (522, 660, human RCT, positive), (523, 660, human, positive), (524, 660, animal, positive), (525, 630 vs 660, human, positive), (526, 660 vs 810 vs 980 vs 1064, animal, positive), (527, 660+670, animal, positive), (528, 660, animal, positive), (529, 660+760, human, positive), (530, 660 vs 830, human, positive), (531, 660, human RCT, positive), (532, 660, human RCT, negative), (533, 660, haman RCT, positive), (534, 660, human RCT, positive), (535, 660, human positive), (536, 660+780, human, positive), (537, 660, human, positive), (538, 660, animal, neutral), (539, 660+808, human, neutral), (540, 660, animal, neutral), (541, 660+
780, human, positive), (542, 660, animal, positive), (543, 660, human, positive), (543, 660, human, positive), (544, 660, human, positive), (545, 660, human, positive), (546, 660, human RCT, positive), (914, 658, human RCT, negative).

Oral, Oral Mucositis - 808 & 810nm - (551, 660 vs 810 vs 660+810, positive, human RCT), (552, 660 vs 810+980, positive, human RCT), (553, 810, neutral, human RCT), (554, 635+815, positive, human), (555, 810, negative, animal), (556, 660 vs 810+980, positive, animal), (557, 660 vs 808, positive, human RCT), (558, 660 vs 660+808, positive, human RCT), (559, 660 vs 808, positive, human), (560, 635+808+660, positive, animal), (561, 660 vs 810 vs 980 vs 1064, positive, animal), (562, 660 vs 810 vs 980 vs 1064, positive, animal), (563, 660 vs 808, neutral, human).

Oral, Oral Mucositis - 830nm - (358, 830, positive, human RCT), (359, 830, positive, human RCT), (360, 685+830, positive, human RCT), (361, 660 vs 830, positive, human), (362, 830, positive, human), (363, 830, positive, human), (364, 830, positive, human), (365, 830, positive, human), (366, 830, positive, human).

Oral, Orthodontics: Pain - 808 & 810nm - (578, 808, positive, human RCT), (579, 808, positive, human), (580, 808, positive, human RCT), (581, 808+10,600, neutral, animal), (582, 808, positive, human RCT), (583, 810, positive, human RCT), (584, 660+810, positive, human RCT), (585, 810, neutral, human RCT).

Oral, Orthodontics: Pain - 830nm - (373, 830, negative, human RCT), (374, 830, positive, human), (375, 830, positive, human RCT), (376, 830, positive, human RCT), (377, 830, neutral, human RCT), (378, 830, positive, human RCT), (379, 830, positive, human RCT), (380, 830, positive, human RCT), (381, 830, positive, human RCT), (382, 830, positive, human RCT), (383, 830, negative, human RCT).

Oral, Orthodontics: Tooth Movement - 850nm - (154, 850, positive, human), (155, 850, positive, human), (156, 850, positive, human), (157, 850, positive, human), (158, 850, negative, human RCT), (159, 850, negative, animal), (160, 850, negative, animal), (161, 850, neutral, human RCT), (162, 850, positive, human RCT), (163, 850, positive, human RCT), (164, 850, positive, human RCT), (165, 630+850, negative, animal).

Oral, Osteonecrosis - 660nm - (563, 660, animal, positive), (564, 660+808, human, positive), (565, 660, human positive), (566, 660+808, human, positive), (567, 660+808, human, positive), (568, 660+808, human, positive), (569, 660, animal, positive), (570, 660, human, positive).

Oral, Osteonecrosis - 1064nm - (106, 1064, human, positive), (107, 1064, human, positive), (108, 1064, human, positive).

Oral, Periodontium: Surgical Treatment - 808 & 810nm - (647, 808, positive, human RCT), (648, 810, neutral, human RCT), (649, 810, positive, human).

Oral, TMD - 660nm - (613, 660, human RCT, negative), (614, 660+808, human RCT, positive), (615, 660+850, human RCT, positive), (616, 660+808, human, positive), (617, 660, human RCT, positive), (618, 660, human RCT, positive), (619, 660 vs 795, human RCT, positive), (620, 660 vs 780 vs 790 vs 830, human, neutral).

Oral, TMD - 830nm - (409, 830, negative, human RCT), (410, 830, neutral, human RCT), (411, 830, positive, animal), (412, 830, positive, human RCT), (413, 830, positive, human), (414, 840, positive, animal), (415, 830, positive, human), (416, 830, positive, human), (417, 660 vs 780 vs 790 vs 830, neutral, human), (418, 830, neutral, human RCT), (419, 830, positive, human), (420, 830, positive, human), (421, 830, positive, human), (422, 830-904, positive, human), (423, 633 vs 670 vs 830, positive, human), (424, 830, negative, human RCT), (425, 633 vs 670 vs 830, positive, human).

Oral, Tooth Extraction - 660nm - (622, 660+830, animal, positive), (623, 660, human, negative), (624, 660+810, human RCT, positive), (625, 660, human RCT, positive), (626, 660, human RCT, positive), (627, 660+808, human RCT, neutral), (628, 660, human, positive), (629, 660+810, human RCT, positive), (630, 660 vs 808, animal, positive), (631, 660 vs 810 vs 660+810, human RCT, positive), (632, 660, human RCT, positive), (633, 660, human RCT, positive), (634, 660, human RCT, negative), (635, 660+808, human RCT, negative), (636, 660+810, human RCT, positive), (637, 660, human, positive), (638, 660, human RCT, neutral).

Oral, Tooth extraction - 1064nm - (123, 1064, human RCT, positive), (124, 1064, human RCT, positive), (125, 1064+2940, human RCT, positive), (126, 1064, human RCT, positive), (127, 808 vs 1064, human, positive).

Pain Benefits (Acute And Chronic)

Pain, Back Pain - 808 & 810nm - (744, 808, positive, human RCT), (745, 808, positive, human RCT), (746, 810+980+1064, positive, human), (747, 810, positive, human), (748, 808, positive, human), (749, 810, positive, human RCT).

Pain, Back Pain - 830nm - (442, 650 vs 830, positive, human RCT), (443, 830, positive, human RCT), (444, 830, positive, human), (445, 830, negative, human RCT), (446, 830, positive, human).

Pain, Back pain - 1064nm - (129, 850+1064, human RCT, positive), (130, 1064, human RCT, positive), (131, 785 vs 1064, human, negative), (132, 1064, human, neutral), (133, 650 vs 810 vs 810+980+1064, human, positive), (134, 810+980+1064, human, positive), (135, 1064, human, positive), (136, 1064, human RCT, positive), (137, 1064, human RCT, neutral).

Pain, Heel Pain - 830nm - (452, 830 or 850, positive, human), (453, 830, positive, human RCT), (453, 830, negative, human RCT).

Pain, Heel Pain - 850nm - (182, 850, positive, human RCT), (183, 830 v 850, positive, human RCT), (184, 850, neutral, human RCT).

Pain, Heel pain - 1064nm - (138, 1064, human, positive), (139, 785 vs 1064, human, positive), (140, 1064, human RCT, negative), (141, 904+1064, human RCT, positive).

Pain, Multiple Sites - 830nm - (463, 830, positive, human), (464, 830, positive, human RCT), (465, 830, positive, human), (466, 830, positive, human).

Pain, Neck - 830nm - (469, 830, negative, human RCT), (470, 808+905 vs 830, positive, human RCT), (471, 830, positive, human RCT).

Pain, Shoulder - 850nm - (186, 640+850, positive, human), (187, 850, positive, human RCT), (188, 850, negative, human RCT).

Pain, Shoulder - 1064nm - (145, 904 vs 1064, human RCT, positive), (146, 1064, human RCT, positive), (147, 1064, human RCT, neutral), (148, 1064, human, negative), (149, 1064, human RCT, positive), (150, 1064, human RCT, positive), (151, 1064, human, positive), (152, 1064, human RCT, neutral), (153, 1064, human, positive).

Penetration Depth Studies

Penetration, Brain - 808 & 810nm - (774, 808, positive, animal), (775, 660 vs 808 vs 940, positive, human), (776, 671 vs 808, positive, human), (777, 405 vs 532 vs 589 vs 658 vs 810 vs 830, positive, human).

Respiratory System Benefits

Respiratory System, Allergic Rhinitis - 660nm - (688, 660+940, human, positive), (689, 660, animal, positive), (690, 660, human RCT, neutral), (691, 660, human, positive), (692, 660, human RCT, positive), (916, 658, animal, positive).

Respiratory System, Allergic Rhinitis - 830nm - (499, 670+830, positive, human RCT), (500, 830, positive, human), (501, 830, positive, human).

Sleep Benefits

Sleep Medicine, Sleep Quality - 660nm - (717, 660+740+810+870, human RCT, neutral), (718, 660+850, human, neutral), (917, 658, human RCT, positive).

Surgical Benefits

Surgery, Cardiac Surgery - 660nm - (740, 660, human RCT, positive), (741, 660, human RCT, positive), (742, 660, human RCT, positive), (743, 640+660, human RCT, positive), (744, 640+660, human RCT, positive), (745, 660, human RCT, positive), (748, 660+950, human, positive).

Tendon Benefits

Tendons, Tennis elbow - 1064nm - (170, 1064, human RCT, positive), (171, 1064, human RCT, positive), (172, 1064, human, positive), (173, 1064, human RCT, positive),

Thyroid Benefits

Thyroid, Hypothyroidism - 830nm - (547, 830, positive, human RCT), (548, 830, positive, human RCT), (549, 830, positive, human RCT), (550, 830, positive, human RCT), (551, 830, positive, human RCT).

Wound Healing Benefits

Wound Healing, Burns (Clinical) - 808 & 810nm - (865, 808, positive, human), (866, 655+808, positive, human), (867, 650+660+810, positive, human).

Wound Healing, Diabetic Foot Ulcer - 660nm - (833, 660, human, negative), (834, 660+800+970, human, positive), (835, 632+660+850, human, positive), (836, 625+660+850 vs 580-900, human, neutral), (837, 660, human RCT, positive), (838, 660, human RCT, positive), (839, 250+660+820+880, human, positive), (840, 660+890, human RCT, positive), (841, 660+890, human, positive), (922, 648, human RCT, positive).

Wound Healing, Diabetic Foot Ulcer - 830nm - (561, 830 vs 850, positive, human), (562, 830, positive, human), (563, 633+830, neutral, human).

Wound Healing, Pressure Ulcer - 660nm - (887, 660, human, positive), (889, 660+820+870+880+940+950, human RCT, neutral), (923, 658 vs 808 vs 940, positive, human RCT), (924, 658 vs 808 vs 940, human RCT, positive)

Wound Healing, Venous Ulcer - 660nm -(890, 660+880, human RCT, positive), (891, 660+950, human RCT, neutral), (892, 660+880, human RCT, positive), (893, 660+880, human, positive).

Red Light Therapy Wavelengths In Context: How To Interpret The List Above

So, how do you interpet the results I've listed above? And what are the limitations to my approach? I've listed a few of them below - many of which I've considered in previous articles but I still wanted to include them as I cannot assume that you've read all of my other blog posts.

So here you go, the limitations of the approach I've listed above:

I don't differentiate between the type of human study. So a study can be with the design of the gold standard in medicine, the randomized controlled trial, or not. The study can have many participants or not. The study can have big methodological flaws or not. The only thing I've done is use Vladimir's categorization of whether the outcome of a study was positive, neutral, or negative. I've then used that data to make guides on individual wavelengths and their health effects.
I've emailed with Vladimir Heiskanen and we both agree that there are I've emailed Vladimir Heiskanen, and we both agree that there are better approaches than the one I take above. Ideally, you'd do a systematic review on each individual topic. But resources are limited and I work for a for-profit company. We don't get government funding and we cannot spend 150 hours writing a review for each of the, let's say, 200 or 400 different topics (that's a wild guesstimate). So, with constraints on resources, this is the best I could do.
We still don't know to what extent wavelengths overlap or differ from each other with their biological effects. I tend to think that there's a difference, simply because there's a difference in blue light between let's say, 420nm and 470nm light. There's a difference in biological effect between UV light found at 320nm and 370nm. So I also believe that in the red or infrared light spectrum, there's a difference between the biological effects of wavelengths. To know the answer for sure, however, you'd need comparison studies.
Also, keep in mind that many of the studies listed above - perhaps almost all - are done with non-LED panels. LED panels work a bit different than lasers, for instance, because they cover a more significant area of the body and are applied differently. So, that's another reason these studies may not be generalized one-on-one to what you're getting with LED panels - although I do think there's a strong overlap.
My method of choosing a 65% positivity rate is also arbitrary. But I think that cutoff point is decent and defensible. Roughly two out of three studies need a positive outcome for the health effect recommendation of a wavelength, in human studies, to be included above. Also, at least three studies need to be available!
You can make a ton of additional criticism to my methodology. I can list a lot of other limitations here as well but I won't go into them. Some of that criticism is covered in my YouTube interview with Alex about the 810nm wavelength health effects.
Overall though, I think this wavelength benefits guide is the best there is currently on the internet. It's simple without being too oversimplifying. Whenever I see infographics on the internet on what each wavelength does, without any reference to studies where they took the data from, I know it's a complete lie. You're either making your conclusions untraceable, which is bad science, or you're cherry-picking studies without considering the whole of studies that are available on a single topic. Both are wrong, in my opinion!
Moreover, don't take this guide on blind faith. All studies for each of the benefits are included. So if you know to what extent a wavelength has benefits or not, for a given goal, then you will have to read the studies yourself. I cannot read the studies for you or tell you about all of these topics how strong the evidence really is, such as study quality or effect size (how strong an effect is of an intervention.
Lastly, I will update this guide over time, as I add the 630nm cheatsheet, that on 670nm, and so forth. So stay tuned as it's a work in progress!

Finally, let's conclude:

Conclusion: Red Light Therapy Wavelength Effects Are A Work In Progress

This red light therapy wavelength work isn't finished at all. Hopefully, in the future, I've got the resources to make it a lot more nuanced and extensive than it currently is.

Nevertheless, I hope people get some benefit from this guide. I also hope people keep thinking for themselves and don't accept this guide as universal truth but think critically about its implications, also of each of the goals listed and their respective studies.

This is a post by Bart Wolbers. Bart finished degrees in Physical Therapy (B), Philosophy (BA and MA), Philosophy of Science and Technology (MS - with distinction), and Clinical Health Science (MS), has had training in functional medicine, and is currently chief science writer at Lighttherapyinsiders.com