The arc pod is a waterproof self contained clip on fluorescent light unit suitable for all freshwater aquariums tropical or coldwater with built in reflector the lens can be removed and replaced easily making lamp changing simpler designed to mount onto tanks glass width 4 12mm for open top tanks or to the underside of an aquarium hood for increased flexibilityr r the arc pod can be tilted to a vertical position for easy accessr easy to fit waterproof ip67r low maintenancer easy lamp