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[APD] 20 watt bulbs where min 25 watt go

I have read various posts on overdriving lights, I have a question that may fall down that line...
I have a 29 gallon 30 inch long tank that I need to make lights for. Currently there is a 4ft shop light hanging over it with 2 40 watt sunshine bulbs. I have a canopy designed that would allow either removing the very top section to allow the use of the shop light as is or optionally a plywood piece that will sit into a 1/4 inch inset at the top. Figured this way I could use the closed canopy or remove the top totally and have it as open and depend on hanging lights.

My question is this:
The ballast in these cheap walmart shop lights are designed to run " 2- 25, 35 or 40 watt T12 bulbs"
If I gut a couple and use the ballast and endcaps and use 2-24" bulbs it would be putting 20 watt bulbs in it. Since it is not rated for 20 watt bulbs would this be a bad idea? Would the 5 watts difference really make that much difference especially safety wise?


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