Swimming pool lights are fitted into housings in the sides of the pool and these housings should contain enough cable for the light unit to be brought to the pool side.
Step 1 – Isolate the Lights
Turn off the power to the pool lights.
Step 2 – Remove the Light Fixture
Remove the light fixture by unscrewing the (usually) single screw that holds it and prying the fixture loose.
Step 3 – Remove the Lens
Once you have the fitting out of the pool and onto a slightly padded surface carefully remove the lens from the light so that you can get at the bulb.
Step 4 – Remove the Bulb
Remove the bulb, holding it with the soft cloth just in case the bulb breaks when you try to twist it.
Step 5 – Clean the Fixture
Clean out the light fixture using a soft cloth to wipe all the interior surfaces.
Step 6 – Replace the Bulb
Replace the bulb with one of the correct size and rating.
Step 7 – Check That the Bulb Is Working
Check that the bulb is working by very briefly turning on the power. It is important to remember that these special bulbs are designed to work underwater and need the presence of water to carry away excess heat.
Step 8 – Replace the Gasket
Replace the lens using a new lens gasket—the old gasket should be discarded since it will no longer work properly.
Step 9 – Test the Fixture for Leaks
Submerge the fixture to ensure that the seal is sound and no water will enter it. There will be a fine stream of bubbles from any gaps in the seal.
Step 10 – Replace the Fixture
Replace the fixture while carefully coiling the spare cable behind it, and replace the securing screw which should not be over-tightened.
Pool bulbs last a very long time so you won’t have to replace that one again for a while.