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. 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. Reflector can be angled to direct the light into the aquarium or terrarium. Maximises the light in your tank. Made from a sturdy aluminium design. Optimised reflector models for T5 lamps.