whoa sounds like a whole lot of effort.if you dont want to risk massive electrical shock and moisture issues but want to use the fridge as a grow box just get temperd glass and a fan,that way you dont need a vented light.the glass is around $20 and is 18"x22" it would be the same idea as a air cooled hood.you wouldnt need to waste the power freezing a lamp and the plants will thank you for it.