AQLighting doesn't carry replacement pool bulbs, but they say they'll check with their supplier to see if they carry any.
They carry underwater lighting products, so I would think that they would be able to get bulbs that are suitable for pool use.
I don't think that the bulbs have to be swimming pool rated.
I think that the light fixtures have to be swimming pool rated but probably not the bulbs.
As far as I know, the bulbs do not need to be pool rated.
However, the bulb should be rated for being in an enclosed fixture since the enclosure typically traps heat in the fixture and the bulbs need to be rated for enclosed spaces.
Look for enclosed fixture, wet location, maybe rough service, lifetime rating, maximum operating temperature etc.
Many bulbs will be made in China, but look for a recognizable brand like Philips etc.
Buy from a reputable source and avoid Amazon.
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Verify the maximum bulb dimensions that will fit in the fixture.
Verify the fixture rating for total wattage.
Verify the light output desired in Lumens, which might be rated in Incandescent wattage equivalents.
Incandescent bulbs produce most of their light as infrared and the visible light is only a small fraction of the total light produced.
This is why an 8 watt LED is equivalent to a 100 watt incandescent bulb in output of visible light.