Hair Growth
630nm Research
- 630-690 nm Red (plus Near-Infrared) LED Helmet Improves Hair Density and Scalp Condition
Fifty adults with hair loss wore a helmet emitting 630-690 nm red light together with 820-880 nm and 910-970 nm near-infrared light for 20 minutes daily for 24 weeks. Hair density and hair thickness increased significantly, vertex sebum decreased, and 73% of the 49 who finished were rated as improved - though this was a single-group study with no sham comparison.
- Review: How Red Light May Stimulate Hair Regrowth in Pattern Hair Loss
A 2021 review concludes that low-level light therapy can accelerate hair growth in people with androgenetic alopecia, and summarises the likely mechanism: light absorbed by chromophores in the follicle triggers nitric oxide release and modulates reactive oxygen species, boosting cell energy and follicle activity.
HeroSeries panels and face masks use 630nm red light
650nm Research
- Randomised Trial: 630, 650 and 660 nm Helmet Increases Hair Density and Thickness
In a 24-week randomised, double-blind, sham-controlled multicentre trial, 40 people with pattern hair loss used a home helmet emitting 630, 650 and 660 nm light for 18 minutes daily. The light group gained significantly more hair density and hair diameter than the sham group, with no serious side effects.
- 650 nm Laser Cap Increases Hair Counts in Women by 51%
In a multicentre randomised controlled trial, women aged 18-60 with pattern hair loss used a 650 nm laser cap every other day for 17 weeks. Those using the active device achieved a 51% increase in hair counts compared with sham-treated controls, and the treatment was judged safe. While this study used lasers, other studies show "LED light can be as effective as LASER, since both have similar biological effects, with no significant difference between them".
- 650 nm Red LED Light Promotes Hair Growth in Lab Model
In lab tests on human hair follicles from people with hair loss, treating with 650 nm red LED light for 5 minutes every other day led to longer hair shafts, more growing follicles (45% stayed in growth phase vs 33% in controls), and higher cell activity, potentially helping treat baldness by activating anti-inflammatory and energy-boosting genes.
- 650 nm Laser and 660 nm LED Helmet Improves Hair Coverage (Split-Scalp Trial)
In a 24-week randomised, double-blind trial of 100 people with pattern hair loss, one side of the scalp received a helmet's 650 nm laser/660 nm LED light and the other side sham light. The treated side showed greater hair coverage (14.2% vs 11.8%), thickness and count, and the device was well tolerated.
HeroHat Laser uses 650nm red light
660nm Research
- 625 and 660 nm LED Cap Trial in Androgenetic Alopecia
A multicentre, double-blind randomised trial (160 people, 10 minutes daily) compared three LED caps - red (625 and 660 nm), blue (425 nm) and red-plus-blue - with a sham cap. No single cap reached statistical significance on its own at 16 weeks, but pooled together the three active caps gave 28.5 more hairs per cm² than sham (p = 0.033) and were well tolerated.
- 660 nm LED Reduces DHT for Hair Loss Treatment
Lab studies showed that 620 and 660 nm LED light stimulates nitric oxide and reactive oxygen species, which inhibit the production of DHT (a hormone causing hair loss), providing a mechanism for how red light therapy promotes hair regrowth in androgenetic alopecia.
- 660 nm LED Stimulates Dermal Papilla Cells for Hair Growth
In vitro tests on human hair cells found that 660 nm LED light boosts cell proliferation through Wnt/β-catenin and ERK pathways, leading to longer hair follicles and suggesting benefits for treating hair thinning.
HeroSeries panels, HeroBelt and HeroHat LED use 660nm red light
Did you know most hair growth studies focus on red light in the 630-660 nm range - not near-infrared? That’s why we highlight red wavelengths on this page. Since many hair growth studies use a mix of LEDs and lasers, we offer both the HeroHat LED and HeroHat Laser - plus a discount when you bundle them together.
Devices informed by hair growth research³
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HeroHat Laser™ Red Light Therapy Hat
Regular price $699.00 - $1,448.00 AUDRegular price$699.00 - $1,448.00 AUDSale price $699.00 - $1,448.00 AUD- 650nm 5mW lasers
- 132 or 272 diodes
- Lifetime Support
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HeroHat LED™ Red Light Therapy Hat
Regular price $449.00 - $1,448.00 AUDRegular price$449.00 - $1,448.00 AUDSale price $449.00 - $1,448.00 AUD- 660 & 850nm
- Wall or power bank
- Lifetime Support
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HeroPanels Elite™ 10 Wavelength Red Light Therapy Panel
Regular price $1,199.00 - $6,698.00 AUDRegular price$1,199.00 - $6,698.00 AUDSale price $1,199.00 - $6,698.00 AUD- 590-1072nm
- 3 sizes
- Lifetime Support
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Hero60™ Tabletop Red Light Therapy Panel
Regular price $999.00 AUDRegular price- 630-850nm
- Fits most backpacks
- 3-Year Warranty
Other red light therapy research
- Sleep quality
- Pain and inflammation
- Muscle mass and recovery
- Collagen production, skin and wrinkles
- Neural function, depression and brain diseases
- ATP production and mitochondria function
- Injuries and wounds
- Eyesight
See the studies for yourself by clicking the links above or visit our RLT Wavelength Research page for an overview.