The LED 28W 18.2 Ah is the primary light to use when you need a lot of light. It does not compromise. The head outputs powerful beam in cool white featuring an optimal balance between spot and corona. The 18.2 Ah canister is well balanced and will power the light head for about 5 hours. It recharges completely in roughly 5 hours. This light provides the illumination you need when doing those great wreck, cave or reef night dives.