L6A-Ex The L6A-Ex is very similar to the manual L6-Ex, but it is an automatically activated light. It uses a lead to ensure the light comes on in the water and allows the light to be manually switched off if required. Both types utilise the latest electronic circuitry that ensures the light flashes at between 50 – 70 times per minute. Both types are supplied with a unique mounting clip to assist easy f ixing to lifejackets.