The GamePro Bubo Onboard XL is a rifle-mounted version of GamePro's Bubo XL spotlight, supplied with mounts so the light can be fitted to a rifle or scope for night hunting and predator control. It uses a 15 W LED rated at 1,040 lumens, giving enough reach to identify animals at distance while keeping both hands on the rifle. Mounting the light means the beam follows where you aim, which is handier than holding a separate spotlight. We could not find a product page with full specifications for this onboard version (battery, runtime, switch type or mount sizes), so this description is based on the product name and the related Bubo XL spotlight.