T-H Marine 20' Blue LED Under-Deck Pontoon Light Kit

The T-H Marine Blue Pontoon Light Set turns the water under your deck into a soft blue glow the moment the sun goes down. It's an under-deck LED kit built specifically for pontoon boats, and it's the kind of upgrade you notice every single evening you're out. The strips mount out of sight beneath the deck, throw light down and out across both tubes, and give you that clean waterline glow without a single visible fixture staring back at you.

Here's what you're working with. The kit runs off your boat's standard 12-volt DC system, so there's no separate power pack to rig up. You get flat, flexible ribbon LED strips rated IP68, which means they're sealed tight against spray, splash, and the odd wave that reaches up under the deck. The set includes twin 20-foot strips, one for each pontoon tube, so a 20-foot boat gets covered end to end. A waterproof wiring harness comes in the box, along with aluminum mounting channels that both protect the strip and give you a straight, finished line to follow along the crossmembers.

Installation is straightforward, and you don't need to be an electrician to pull it off. The channels carry the strip and the strip's adhesive backing helps you position everything before you commit. That said, take a tip from folks who've run these a few seasons: back the adhesive up with the channel screws, especially where the tubes curve. Tape alone tends to let go after a while under the deck, so the screws are what keep the run put for the long haul. Wire the harness into a switched 12-volt circuit and add an inline fuse. It's cheap insurance against a voltage spike from a jump-start or a charger, and it keeps the LEDs happy for years.

Who's this for? Pontoon owners who anchor out and want the deck to look as good after dark as it does at noon. It's a favorite for boats that host a crowd, for late-evening cruises when the family doesn't want to head in yet, and for anyone tying up at a busy dock who likes being seen coming in. The blue glow reads calm and upscale, and it makes the swim platform and the water around the boat a lot easier to see when someone's climbing in or out.

A couple of honest notes so you buy right. This is an under-deck kit, not a submersible transom light. It mounts up under the deck above the waterline and lights the water below, so it's about ambiance and visibility around the boat, not lighting up fish down in the water column. And blue does draw the occasional bug when you're sitting still at anchor on a warm night, same as any blue light on the water. Neither of those is a knock, just worth knowing before you rig it.

A word on the wiring, because it's where most people either nail it or fight it. Run your feed off a switched source at the helm so the lights come on with a flip and off when you shut the boat down. Keep your connections up out of standing water where you can, and if you have to make a joint down low, seal it with heat-shrink so moisture can't creep in. LEDs sip power, so you're not taxing the battery even on a long evening at anchor, but a clean, fused feed is what keeps the whole run trouble-free season after season. Do it once, do it right, and you'll forget it's even there until the sun goes down.

Because it's a T-H Marine kit, the harness and channels are sized to work together out of the box. You're not chasing down connectors or hunting for a mounting track that fits. It all comes in one package, cut to a 20-foot run, ready to wire in on a weekend. For pontoon owners who want a finished, factory-clean look under the deck, this is about as simple as a lighting upgrade gets, and it's the sort of touch that makes the boat feel finished the way the factory should have done it in the first place.