The Yna Super LED delivers 36,000 lux at a 42cm target. The Japanese designed and manufactured LED embodies the typical Japanese attention to detail and ingenious refinements not present in like products of other manufacturers. The features include a variable iris, in-line on/off switch, a secondary on/off switch and brightness control on the battery pack, 2 re-chargeable batteries each providing 13 hours of continuous use. All wires have been fabricated with a silicone based insulation that is extremely flexible and will not lose its inherent flexibility in cooler or cold environments. The illuminated patch of light at the target is a sharp and clearly defined circle. The Yna Super with all extras is an outstanding product. This Super LED is fully compatible with all current Hogies frame systems. It is the perfect companion to the MaximEyes Prismatic Loupe.