Joenj, most pool lights come out and reinstall very easily - 1 screw at the top. After you do it a few times, it becomes very easy to get it back in right. Cleaning out the niche is an excellent idea, not only for closing, but regularly throughout the summer. The water in an ~uncirculated area such as that is a perfect breeding ground for algae, Ben said on www.poolsolutions.com that brushing is required to 'stir up' the water in low circulation areas, such as around inlets/ outlets, walls, etc., to keep the 'greenies' at bay - so it only makes sense to clean the niche.
A quick, perhaps easier, idea is to weekly squirt some high concentration chlorine into the niche (turkey baster comes to mind), without having to remove the light. Just a thought...
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