Jandy JLU4C12W150, JLU4C12W100, and JLU4C12W50 Replacement: Common Defects and Sizes for WaterColors 1.5 Inch Lights

If the color light in your pool or spa threads into a 1.5 inch fitting, the label on the back of the fixture tells you almost everything you need to know. Jandy WaterColors nicheless lights are identified by part numbers like JLU4C12W150, JLU4C12W100, and JLU4C12W50, and once you can read that number, picking the right replacement takes about a minute. This guide covers how the numbering works, the common sizes in the lineup, the defects that end these lights, and how our drop-in LED replacement compares to the original.

How to read the part number

Take JLU4C12W150 as the example, since it is the most common version we get asked about. JLU4C is Jandy's WaterColors nicheless color series. The next number is the wattage, so 12W here. The last number is the cable length in feet. So JLU4C12W150 is the 12 watt color light with a 150 foot cable, JLU4C12W100 is the same light with a 100 foot cable, and JLU4C12W50 has a 50 foot cable. A trailing letter such as S, P, or H (for example JLU4C12W100S) indicates a fitting or packaging variation of the same light. White only versions use JLUW for daylight white and JLUWW for warm white.

Common sizes in the WaterColors lineup

Every light in this family threads into the same standard 1.5 inch nicheless fitting, so the physical size does not change between models. What changes is wattage and cable length. The current generation runs 6W, 12W, and 24W. The previous Gen 2 lights used 9W, 20W, and 30W numbering (JLU4C9W, JLU4C20W, JLU4C30W). Cable lengths are 50, 100, or 150 feet across the board, and the cable length has no effect on fitment, only on how far the light can run back to your junction box.

One thing to confirm before ordering: this guide covers the small 1.5 inch nicheless lights only. If your Jandy light sits in a recessed can in the wall, you have a niche light instead. We cover those with our 6 inch spa niche replacement and 10 inch large niche replacement.

Common defects when a WaterColors light fails

These are sealed units with no serviceable bulb, so when one fails, the fix is replacement. The failure patterns we see most often:

• Water intrusion. Fog or condensation behind the lens is the early sign. Pool chemistry works on the seal over a few seasons, water reaches the electronics, and corrosion finishes the job. Silicone over the lens does not fix this once it starts.
• Flickering or dimming. Usually the driver electronics degrading from heat, and it tends to get worse until the light quits.
• Stuck on one color or out of sync. The light stops responding to the controller's color commands or drifts out of sequence with other lights on the circuit.
• Dead LED sections. Part of the lens goes dark while the rest still works, which shows up as uneven or tinted output.
• Cable jacket damage. Cracked or nicked jackets in the conduit run let water track down the cable into the fixture.

The drop-in LED replacement

Our LED replacement for Jandy WaterColors 1.5 inch lights threads into the same 1.5 inch nicheless fitting and runs on the same 12VAC, so it installs exactly like the original with no rewiring. It is built specifically against the failure modes above: a perma-seal resin filled housing instead of a hollow shell, a high-efficiency CREE LED chipset with liquid heat-transfer cooling, a soft glow diffuser for even output with no hot spots, and a rugged-jacket cable that pulls through tight conduit without binding.

It runs 14 RGB Jandy Matched color modes and works with Jandy AquaLink RS, upgraded TCX retrofit kits, and the WaterColors LED Light Controller. No automation? A standard on/off switch works too.

12W or 30W High Output: how they compare to the original

Our 12W replacement is comparable in brightness to the original Jandy 12W light, so if you liked how your pool looked before the light failed, that is the direct match. Our 30W High Output version delivers about twice the brightness of the original. Choose the 30W if you have a single light covering a large pool, or if you simply want the most vivid color output available in this form factor.

Matching your part number to the right order

Order by wattage and cable length. If your label says JLU4C12W150, choose the 12W with 150 foot cable, or step up to the 30W High Output in the same length. JLU4C12W100 maps to the 100 foot cable, and JLU4C12W50 to the 50 foot cable. The same logic applies to 6W and 24W originals, and to the Gen 2 9W, 20W, and 30W numbers: match the cable length, then pick 12W for original brightness or 30W for about double. If you want white only instead of color, we can custom build those, so just choose the white option on the product page.

Installation without draining the pool

Like the original, this is a deck-side swap. The old light unthreads from the fitting and comes up on its own cable, the new one pulls back through and threads in, and the whole job typically takes about 30 minutes. More detail in our guide on replacing a pool light without draining the pool.

Every light is covered by a 2-year warranty against water intrusion and LED failure, with free US shipping. Not sure which model you have? Text a photo of your light or its label to (239) 350-3110 and we will confirm fitment before you order. For the full background on this fixture family, see our complete Jandy WaterColors upgrade guide.