Mighty Bright 42313 UltraThin Book Light, Purple Bright white, energy-efficient LED Durable LED lasts 100,000 hours - no replacement necessary Precisely engineered optical grade lens spreads light evenly Clip or free-standing base Ultra-compact Bright white, energy-efficient LED Durable LED lasts 100,000 hours - no replacement necessary Precisely engineered optical grade lens spreads light evenly Clip or free-standing base Ultra-compact