well ,i'm not a fire safety officer or anything .But my initial thoughts were .What if that ballast mounted an inch or so off the floor on some wood caught fire ,would the plastic not melt and potentialy catch fire to causing the whole room to go up? and similarly ,what if you had an accident with your light ,and your bulb broke and fell on the floor ,same kind of thing.. but i don't know for definitate if its bad ,that would be just my concerns.Lol that only for another week im transplanting to 3 gallon pots. Why not the plastic floor? I have trays for each pot to catch drainage. Yeah lol i have a playlist playing 24/7