How To Replace A Swimming Pool Or Spa Light


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Some failed Spa lights can be changed by simply replacing the bulb, but for many, you will have to change the whole light fixture including the 50' cord that connects back to the house. This guide shows you how to replace a Spa light fixture and cord.

Please click here to view the pool and spa lights. 


Step by Step


Step 1

IDENTIFY SPA LIGHT - To make sure you are purchasing the correct replacement light fixture you may have to look at the light information on the backside of the old light fixture. This will involve removing the old light fixture out of the niche in the Spa wall. Generally this information includes the model #, the watts, and the volts. The manufacturer's name is often pressed into the lens. For information on removing a light fixture see How To Identify a Replacement Pool Bulb / Light. You may want to drain the spa water into the pool to get to the light fixture more easily.

Step 2

TEST NEW LIGHT - When you receive your light fixture, test it to make sure it works. You don't want to go through the effort of replacing this light just to find out it doesn't work either. Get an extension cord and before plugging it into the wall, push the white and black leads into the slots of the plug. Then plug the extension cord into the wall for 2-3 seconds to see the bulb light up. ONLY LEAVE THE LIGHT ON FOR 2-3 SECONDS. These lights are designed to only operate in the pool and will burn out quickly if not cooled by the pool.

Step 3

TURN OFF POWER TO THE SPA LIGHT at the circuit breaker box.

Step 4

EMPTY THE SPA WATER into the pool. Most pool systems have diverter valves to move water from the spa into the pool. If it is too much trouble to dump the Spa water, you can remove the light fixture with a snorkel and mask.

Please click here to view diverter valves. 

Step 5

REMOVE PILOT SCREW - Most Spa light fixtures are secured to the niche in the pool wall with a single screw at the top of the light. Remove this screw.

Step 6

REMOVE LIGHT FIXTURE - Pull the Spa light fixture out of the niche. You should have enough excess cord to be able to lay the Spa light fixture on the Spa floor. Note how the excess cord is stored in the niche so you can replace it the same way when you reinstall the Spa light.

Step 7

OPEN JUNCTION BOX - The light cable is run between the Spa light and a junction box usually placed next to the power box at the house. Open this junction box to access the other end of the light cable.

Please click here to view a junction box. 

Step 8

DISCONNECT LIGHT CABLE - Unscrew the three cable wires from their terminals in the junction box. Normally these wires are black (load), white (neutral) and green (ground). Note where they are so you know where the new cable is attached. I sometimes take a picture of the setup before I take it apart. One other note. These lights will be powered by 12V or 120V. The 12V systems will have a transformer between this box and the house power box. This is not an issue here since it's on the other side of the junction box.

Please click here to view the transformers. 

Step 9

FASTEN FISH TAPE TO SPA CABLE - You will be using the existing old cable to help pull the new cable through the conduit between the power box and the niche in the Spa wall. Pull about 18" of the old cable out of the conduit at the junction box and strip about 1' of the casing off the end of the old cable. Double over the black and white wires to form a loop to connect a 1/4" flat fish tape onto. Tape the whole length with electricians tape (6" of doubled over black and white wire, the connection of the black and white wire and the fish tape, and 6" of the green wire and fish tape). Make sure there are no loose wire ends that could get snared in the conduit. String about 50' of fish tape straight out from the junction box so that it will play into the conduit easier.

Step 10

PULL OUT OLD CABLE- At the spa, pull out the old cable from the conduit running to the house. As you pull this cable out, you will be pulling the attached fish tape into the conduit at the junction box end.

Step 11

ATTACH NEW CABLE TO FISH TAPE - At the SPA, when all of the old cable is out and you can see the end of the fish tape, disconnect the old cable and attach the new cable in the same manner as the old cable was attached.

Step 12

PULL IN NEW CABLE - At the junction box, pull on the fish tape to pull the new cable into the conduit from the Spa. When the new cable is through, continue pulling on the new cable until there is only 3-4 extra feet on the Spa side (from the light to the nitch). This wire will be coiled behind the new light so that when you need to replace it in the future, you will have enough cable to lay the light on the Spa floor.

Please click here to view the pool and spa lights. 

Step 13

ATTACH NEW CABLE TO JUNCTION BOX - Remove the fish tape from the new cable. Cut off excess wire and attach the three wires onto their respective terminals as noted above.

Step 14


Step 15

RETEST LIGHT - Apply power for 2-3 SECONDS ONLY to confirm that the light is operational.

Step 16

INSTALL LIGHT FIXTURE - With the power off, coil 3-4 feet of excess wire into niche and place the light fixture into the niche. Secure the light fixture with the pilot screw.

Step 17


Step 18

TEST THE LIGHT after the Spas is filled to make sure it is still operational. You can leave it on as long as you want now.

Please click here to view the pool and spa lights. 


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InyoPools Product Specialist  Posted: 8/20/2017 

Brian - I'm not sure how your pumps are set up, but for a single pump, you would shut off the pipes providing water into the spa while leaving the spa drain open to purge the spa water. Leave some water in the bottom of the spa so the spa drain doesn't suck air into the piping and cause the pump to lose prime.

 Posted: 8/17/2017 

On Step 4 "Empty Spa water into the Pool"...can you provide me details on exactly what steps I take to empty and then re-fill the spa water? ie. what valves to turn and what pumps to Turn to empty, and then re-fill...any pictures would help. I have Hayward pumps and the spa has a waterfall into the pool. Thanks

InyoPools Product Specialist  Posted: 5/8/2017 

chrismackey - I do not know the answer to this question. Try calling Pentair at 800-831-7133. They should know what LED lights can fit into the Sunlight niche.

 Posted: 5/4/2017 

I have a Sunlite light fixture that needs to be completely replaced. I would like to change it to a LED color changing light what would you suggest? The bulb on this one reads 71w 12v

Anonymous  Posted: 6/16/2016 

The best part about this video is the dog hanging out while he changes the light.

Anonymous  Posted: 6/8/2016 

I have just replaced my spar light and found that the conduit between the JB and the spar was sealed with a very strong adhesive silicon calking. It was very difficult to remove as the cable would not budge at all unless the calking was removed. It is important to note that if the conduit is not sealed after installing the new cable water could leak at a considerable rate via the conduit.

 Posted: 11/10/2015