Insulated Closet

I got two closets that im thinking of converting 1 for veg 1 for flowering, my question is if they have insulation showing will just covering everything with panda plastic be enough to keep the insulation from starting a fire once a 600w hps is running 12 hours a day, the closets are like 4x4x8. or should i cover the walls with something first and then hit it with panda.thx.

You could, its not necesary. If you were going to make it living space you would put a vapor barrier over the insulation and then the drywall etc. after that. If the panda plastic melts you might have a problem. The insulation will not start a fire. VV