Complex sentence: Possibly the most significant innovation was the first flashlight using the high power Luxeon Star LED, the Arc LS--the first solid-state LED flashlight to produce output comparable to incandescent bulb designs.
Split into simpler sentences: Possibly the most significant innovation was the first flashlight using the high power Luxeon Star LED, the Arc LS. This for the first time enabled a solid-state LED flashlight to produce output comparable to incandescent bulb designs.