The Lumenite® Light Sleeve is a semi-translucent, photoluminescent sleeve that fits readily over new or existing fluorescent tubes. It absorbs light from the fluorescent lamp when lit, and emits light in the event that the light source is removed (eg blackout). The emitted light is projected onto pathway obstacles to provide visual guidance around them so that safe, orderly and expedient evacuation may occur. The chemical composition is finely balanced to minimize lumen loss from the lamp during normal operation while maximizing available usable light in the event of a blackout. In addition to providing backup evacuation lighting, the Lumenite® Light Sleeve can also be utilized to establish escape route paths creating a 'breadcrumb' effect providing easy to follow evacuation routes. Instant and fail-safe activation : 100% reliable; always on; no hazardous delay period waiting for a generator to start; does not rely on maintenance having been performed, batteries being charged, or lamps & other components; nothing to fail Save money : low initial cost, quick & easy to install, no ongoing costs, no maintenance, no power usage, no batteries, no wiring Environmentally friendly :non toxic, non radioactive, no batteries, no energy usage Convenience : no tools needed, no alterations to existing fittings Safety and security : increased safety, increased security, areas kept illuminated under all conditions Glass containment : provides tube breakage protection, qualifies as a glass containment device.