Firefly Portable Red Light Therapy Device

Firefly — Handheld, Battery-Powered COB Device

630nm · 660nm · 830nm

Light is a nutrient — and like any nutrient, it only works if you're consistent about getting it. A device that needs an outlet and a dedicated room is a device you'll use less: travel, road trips, hotel rooms, months across time zones all break the habit. The Firefly is built for exactly those moments — the world's first handheld, battery-powered COB light device, carry-on sized, running off a standard USB-C battery bank.

Two years for one battery: a COB chip draws far more power than the single diodes in typical handhelds, and no existing battery could hold that charge in a handheld form — which is why a device like this didn't exist. It took us two years to develop one that could. That battery is what's patent-pending, and it's also the honest reason the Firefly runs a 75W COB while our panels run 200W and up: after two years of development, 75W is the largest chip our battery can drive in a handheld. We publish that plainly rather than overstate it.

COB in your hand: 25 × 3W diodes bonded directly to a substrate in a 1-inch array — no housings, no gaps — behind a 60-degree cone lens that directs the output instead of letting it scatter. The result is a dense, even beam from a device you hold in one hand, with effective irradiance at a comfortable working distance: 12–24 inches, same as our panels. For scale: Light Labs International measured our panels' 200W COB at 138.39 mW/cm² at 6 inches — the Firefly's 75W chip runs proportionally lower.

The wavelengths: 630nm and 660nm red with 830nm near-infrared — two peaks in the red window and one in the near-infrared, the two ranges where cytochrome c oxidase, the mitochondrial enzyme at the center of photobiomodulation research, has its absorption peaks. 630nm and 660nm work in the dermis (fibroblast activity, collagen production), and 830nm penetrates centimeters into muscle, joint, and connective tissue. 830nm is invisible to the eye — wear the included goggles every session. And you can verify the peaks yourself: Robert Hunt, author of The Blue Light Diet, measures the Firefly on camera with his own spectrometer in the gallery above.

Why battery power matters: flicker and magnetic fields in light devices come from AC power — the grid current alternating. The Firefly runs on DC from a battery: no AC current at all, so no AC-generated flicker and no AC-generated magnetic field, by architecture rather than by mitigation. Our panels answer the same physics with Meanwell drivers and a 12-inch session distance; the Firefly answers it by never touching the grid.

How to use it: start with 5 minutes and build to 10 minutes per session. Hold it 12–24 inches from the target; for your face, 18–24 inches. Up to 5 sessions per week. A full charge runs 1 hour 30 minutes, and any standard USB-C power bank extends that — we recommend 20,000mAh+ for full-length sessions on the road.

Check the Specs

• Wavelengths: 630nm · 660nm · 830nm — 2:1 red-to-NIR
• 75W COB: 25 × 3W diodes in a 1-inch array · 60° cone lens
• Power: internal rechargeable battery (1.5 hr per charge) · runs from any standard USB-C battery bank
• Flicker: 0% — DC power, no AC ripple · no AC-generated magnetic field
• Carry-on sized and flight-friendly — battery banks are carry-on compliant
• Includes: luxury travel case + blackout goggles
• Patent pending · indoors recommended, not waterproof
• Warranty: 1 year