What material for lighting tray in my canopy?

RicGio

Member
I'm building a drawer glide tray/shelf that will let me pull out the whole lighting system from my canopy. I need some opinions on what material to build the shelf out of. It needs to be humidity and temperature resistant. I was thinking of using the white melamine they sell in Home Depot for shelves, but its particle board and only 3 sides are "sealed". would this absorb the moisture and swell/warp? how about spar varnish sealed plywood?
 
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