The Firefly PRO Solas emergency strobe light produces over 41 candelas of light per strobe (360 beams of light) for up to 56 hours of use (with AA lithium batteries). These are the brightest strobe lights on the market today. Using wide-light emission LEDs, it cuts through even the toughest conditions, creating a super-bright flash visible for over 3 miles. Add the Firefly Pro to your flight bag. It may save your life oneday when you least expect it.