This self-igniting lifebuoy light L90 LED, automatically lights up when it contacts water via a tilt switch. Minimum 2 cd Light output, minimum 2 hour light duration, full approval to MED/SOLAS standards. All Daniamant Lifebuoy lights are designed to deliver, as a minimum standard, the 2cd output specification and 2 hour duration required by IMO SOLAS regulations. The L90 uses five alkaline batteries, offering a life of one year. Robust and reliable, the L90 is automatically activated after release.