High temps kill plants anyway. I am running 400W in 20"x36". That's 11,000 lumens per sq ft. First couple of days the tent smelled like plastic but I ran my tent for a week before I put a plant in it. No plastic smell at all anymore. Exhaust is the key. Even if the plastic continues to offgass small amounts over time if you are removing the air with a fresh supply intake I don't see how it would be that big of deal.
They certainly needed to be changed and I applaud the manufacturers who did the voluntary recalls but I just think too much is made of it.