Extra-large 7.5" x 6.25" rectangular glass lens, optical-quality 5-diopter magnification * 108 ultra-efficient LED produce eye-pleasing task lighting on less than 8-watts - last 100,000 hours * Heavy-duty clamp system holds firm to desk or tabletop up-to 2.5"-thick without damaging furniture * 36" triple-joint arm adjusts with feather touch and holds position without springs * Power switch located on lamp head for easy access, 72" power cord; UL listed