The Reef Wall That Came Alive: A Genwiss Dive Light Story

The light I borrowed from the dive club threw a weak, yellowy cone about as far as my outstretched hand. It was a night dive on the outer reef, flat water, warm enough that I skipped the hood, and I spent the whole hour squinting at a coral ledge I could barely make out. I came up that night and decided I was done borrowing equipment.

I rebuilt the kit the following spring, about eighteen months ago, when the mesh bag I had hauled since my Open Water class split along a seam. One order, five pieces of gear, one of them a Genwiss dive light to replace the club loaner. I have somewhere around ninety dives on it now, mostly off the charter boats out of Tavernier and a handful of shore entries, and I have not borrowed a light since.

What it is, plainly. A rechargeable lithium-ion light, 10 watts, 4.2 volts, one battery in the box along with a USB charger. The listing rates it at 1000 lumens and that is the number I go by. Five modes on the switch: high, medium, low, strobe, SOS. The body is aluminum alloy with an anti-abrasive coating, 7.8 inches long, 331 grams. That last number is one you notice when you are holding it out in front of you for an hour.

I bought it the way I buy most things now, which is to read the spec sheet, ignore the adjectives, and see whether the thing survives a season of salt water. A light is one of the few pieces of dive gear where the description and the job are the same thing. You point it. You want to see. Everything else is packaging.

The first real test was a guided night charter in June, water at 84, and we dropped on the outside where the ledge runs maybe fifteen feet tall. I clicked it to high, swept the beam along the wall, and the wall went from gray to orange in one pass. I am not going to pretend I saw something nobody has seen before. It was the same reef I had dived a dozen times in daylight. But I could see the whole face of it, the sponges, the little crabs backed into the crevices, the squirrelfish hanging in the shadow, and I worked that beam along the ledge for forty minutes like a man reading a newspaper.

I swept the beam along the wall and the wall went from gray to orange in one pass.

The routine at home does not change. It comes out of the bag, gets rinsed in the tub under the carport, and hangs on the clothesline to dry. Charging happens the night before a dive, off the USB charger that came with it. One battery means one charge, and I have not run it flat on a night dive yet, though I swim on medium and save high for the ledge.

Five modes is more than I need and I will say so. High and medium do the work. Low is for daylight, looking under a ledge or into a crack, where a full beam just bounces off the sand and back into your eyes. Strobe is for the surface, if you come up away from the boat and want to be found. SOS I have never used and would like to keep it that way. The switch needs a firm press, which I count as a good thing, because a light that comes on inside a bag is a dead light by the time you reach the bottom.

Most of my diving is not night diving. I hunt lost metal in the sand, five years now, at the public swim beaches and around the docks where it is permitted, and I sell what I find at weekend flea markets and through a small online shop. In four feet of water in the middle of the afternoon, the Genwiss is what turns a silver chain in wet sand into a glint you can actually see. I sweep ahead of the coil. Two rings and a brass clasp have come up that way since I bought it. The rings went back to their owners. The clasp went in the box.

What it does not do. It is 7.8 inches and 331 grams, so it is not a pocket light and it will not vanish into a save-a-dive pouch. It runs on one battery, which means charging day is a day you have no light unless you buy a second one. The coating will pick up scuffs after a season of limestone entries, cosmetic only, and I stopped caring about that in July. And 1000 lumens is a dive light, not a video light. If you are down there shooting footage, this is not the tool.

Cal, my regular buddy, carries a different brand and we have compared them on the boat more than once. His is smaller and easier to clip off. Mine is brighter in my hand, though I am not going to dress that up as a measurement. What I can tell you is that I have not had water inside the Genwiss in eighteen months, and I have not had to replace it, and those two things are the whole review.

What I'd Tell You If We Were Sitting at My Kitchen Table

Buy the light you will actually carry, not the one with the best paragraph on the listing. For ordinary recreational diving, 20 to 60 feet, a night dive a few times a year, this one is enough and then some. It charges off a USB charger, it takes a rinse, and it has kept the water out. That is the entire job and it does it.

Two more things. Rinse it in fresh water every single time before it goes on the clothesline, because salt is patient and it wins in the end. And if you dive two nights in a row, buy the second battery, because one battery means one charge and the second night is a long walk back to the car. Dee does not dive and does not touch this gear, so the rinsing is mine. I got lazy about it exactly once. The light survived. The lesson stayed.