Frequently Asked Questions
Here at swimmingpoolsupplies.co.uk we pride ourselves on the unbiased advice that we offer, here are some of the frequently asked questions we receive, if there is a question we haven't answered here either call us on 01924 479717 or send us an email from our Contact Us page.
Pool Lighting
Turn the light breaker off, water and electricity don’t go together. When a bulb in changed, it is important to change the lens gasket. Take the light apart again and remove the rubber seal from the glass lens and replace. If the light's still working, you haven't done any permanent damage.
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How do I change the bulb in the underwater light in my swimming pool?
In most swimming pools the bulb can be changed whilst the pool is full of water. The lamp assembly is screwed or clipped into a housing fixed to the swimming pool wall and, when unclipped or unscrewed, will reach the top of the swimming pool on an umbilical cable.
Put the waterproof assembly on the pool side and unscrew it. Remove the old bulb and ‘O’ ring, clean the terminals, and fit the new bulb and ‘O’ ring. Screw the assembly back together. Wind the excess cable around the assembly as you lower it back into the swimming pool. The assembly needs to be clipped or screwed back into its mounting in the swimming pool wall.
Finally check the deck box terminals. The deck box is a small plastic or metal junction box on the pool side above the light which houses the joint between the cable coming up through a conduit from the light and the cable coming from the transformer (most under water pool lights are 12 volts to eliminate any danger if in contact with the water). It is possible for this junction to become corroded and it is important to replace in the event of signs of rust or heat damage.
Bulbs last a varied amount of time but checking the look of a failed lamp can give some indication of its demise.
If the bulb has turned black this indicates an electrical problem. You will need to consult a qualified electrician.
If the bulb has turned blue this suggests water has got into the light. Water ingress requires careful replacement of the ‘O’ ring seal and checking the cable gland for wear and checking for heat damage of the assembly.
If the bulb has turned white it usually has just worn out.
New under water light "guts" can be purchased which consist of the detachable part of the light fitting (with the bulb inside) and cable. Do consult your swimming pool shop about fitting this unit and remember to pull a draw string through when removing the old one.
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