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The TL4500P Technical Light from Bigblue is a self-contained technical light that features four power settings with an SOS function and gives out 4500 lumens of light. It features a push-button to turn the light on and off, a battery level indicator, and a narrow beam angle of 10°. The TL4500P is constructed of anti-corrosive anodized aluminum alloy. It can be used for down to 328' underwater. As a self-contained light, it uses a Li-ion rechargeable battery pack and comes with a charger. The battery pack is removable for easy replacement.