Arcadia fluorescent tube reflectors will double the light output. When a fluorescent tube is ignited, light is given off evenly in every direction, much of which is directed upwards into the lid of the aquarium or vivarium. If a reflector is mounted behind the tube, this stray light is not wasted, but redirected back to where it is required the aquarium, so that the efficiency of the tube is maximised. Ideal for use on UV tubes to ensure even and strong light source.