Both at-home laser and IPL hair removal devices work the same way at the root: they deliver light energy that is absorbed by melanin in the hair, converted to heat, and used to damage the follicle so regrowth slows over time. The difference is the light itself. Lasers emit a single, concentrated wavelength; IPL devices emit a broad spectrum of pulsed light across multiple wavelengths. That distinction, combined with how much melanin is in your skin versus your hair, largely determines which technology is safe and effective for you.

The Science of Light-Based Hair Removal: How it Works

The foundational concept is selective photothermolysis: producing heat damage at a microscopic target—the hair follicle—while sparing the surrounding tissue. Melanin, the pigment that gives hair and skin their color, absorbs the light energy, which converts to heat and inhibits the follicle. Because the target is pigment, the treatment depends on contrast. Hair with abundant melanin absorbs energy well; skin with little melanin absorbs little, leaving the follicle to take the heat while surrounding tissue is spared.

As the medical aesthetics clinic Facial Aesthetics explains, this is why the physics rewards a particular combination: light skin with dark hair concentrates energy where it is wanted. Braun, which markets at-home IPL devices, notes that for both laser and IPL, effectiveness varies with the treatment regimen, energy level used, body hair color, skin color, and coverage area.