The Coralife Aqua Mirror is an expandable, space-age reflector with 99.9% reflectivity that redirects scattered light into the aquarium to increase light output by as much as 50%. The Aqua Mirror expands in width from 51" to 81" to accommodate up to four T-12 (11" Dia.) lamps or five T-8 (1" Dia.) lamps. Mounting kit included.