Comments about Underwater Kinetics Sunlight SL4 eLED Dive Light:

I gave my UK SL4 eLED 400 lumens light to my dive master in Jamaica in lieu of tips. He claimed shipping was exorbitantly expensive to his village, and he could use the light to supplement his income by (legally) hunting lobsters, so.... Instead of getting another UK light, I bought the Princeton Tec because it uses AA rechargeable batteries, and I already had a supply of those and a charger. I thought it made sense instead of lugging C cells and another charger just for the UK light. Problem is, at only 126 lumens, the Princeton Tec literally pales in comparison with the UK SL4. To make matters worse, the Princeton Tec's switch lock always slides down, meaning I have made many a dive with a hot, bright BC pocket! As long as I remember to check it periodically during the dive, the Princeton Tec makes a decent low-power dive light. I don't do much night diving or cave diving, so this light gets used mainly to brighten up the occasional swim-thru, help my camera focus in low light, or get the attention of other divers. If I can find a more powerful, compact light that uses AA batteries, I'll consign this one to backup status.

Comments about Underwater Kinetics Sunlight SL4 eLED Dive Light:

I bought two of these lights for my daughter and I to use on our AOW dives. 4 of 5 dives were wreck sites, extra light would have been great to help see and take photos.
I took the first one down on the first dive. All was fine until I turned the switch to power it on. Light immediately flooded and went out. This was at 60'. The water in the casing started out clear then turned black from mixing with the battery acid. I ended up with an unusable light (extra weight) and missing many great photo ops.
Get back to the surface and empty out the casing, hoping another set of fresh batteries would grant me a second chance. No such luck. Had to throw it away.
Next day I tried the secong light I had purchased. This time tried it out while I was still floating on the surface waiting for the other divers to submerge. Less than 2' of water and same results. Light flooded instantly at the turn of the switch.
I know what you are thinking. I must not have gotten the seals right after putting the batteries in. I'm pretty sure I did. The lights were watertight even at depth until I turned the switch. Instant flood and worthless weight.
DO NOT BUY THESE LIGHTS!

Comments about Underwater Kinetics Sunlight SL4 eLED Dive Light:

I bought two of these lights - one died before we hit depth, the second died after we surfaced. No sign of flooding or damage in either. I returned both to UK for replacement. First replacement died after first dive - same thing - no sign of failure, just no light. Second replacement hasn't been wet yet.

Changing the batteries is a pain in the buttocks. 'How hard could it be?'you ask - well, I'll tell you - it's hard! You have to drop one in the lower slot, then angle and push the second one into place (not so hard) BUT if you don't keep them both pushed down while inserting the upper row, they pop up and jam in place. Whoever designed this system should be forced to personally visit every user and change their batteries for them.

Comments about Underwater Kinetics Sunlight SL4 eLED Dive Light:

I used this on a work project that required us to leave it, in the water, on for a month. To our surprise when we came to retrieve it, it was still on and giving off light. Not as bright as when we first turned it on, but bright enough that if you shined it on a wall you could see the beam. After being left on for a month! Extremely bright and reliable. This exceeded my all ready high expectations of Underwater Kinetics.

Comments about Underwater Kinetics Sunlight SL4 eLED Dive Light:

400 lumens. Its under the website of the manufacturer.