Improves your hair's condition, density and thickness The LED Hair Growth Helmet emits a spectrum of red light (620-660nm). These broader-band wavelengths reach more of the skin and hair follicles on the scalp, boosting energy in hair follicles, reducing inflammation, lowering dihydrotestosterone (DHT) levels, and improving scalp blood flow. It's proven to enhance hair quality significantly and is even more effective when used with complementary hair regrowth treatments. Feel the fullness: Improve hair thickness, density and fullness with just 10 minutes of daily use. The CurrentBody Skin Anti-Acne LED Pen weighs 20 grams and measures 80 mm wide by 30 mm long by 30 mm high.