I grew with the left cooltube, it's from china, who the fuck knows what kinda glass it is, or what the reflector is made from. Air was constantly sucked through it and shot into the room. I guess I could wonder forever about a million other possibilities as well, but shit when you start thinking about it there's all kinds of stuff you never think about.
I'll ask the doctor about how I'd go about testing the air quality and see if he thinks it's weird for only certain parts of the plastic have changed.
edit:: looks like if the bulbs break/crack/leak they can give you health problems but usually they're on the skin, so you'd get a rash and notice it if there was a crack in the bulb.
you don't also happen to have any inline UV sterilizers for water treatment or anything else in the basement do you? Something that could have somehow become unsheilded? I'm still leaning toward the Ozone as it WILL literally super advance the aging of materials... look for some papers in the basement near the yellowed plastic, does the paper seem unusually brittle or older feeling that it should?
No water sterilizer, I left a bunch of shake on newspapers in there on top of the grow tent and it was all very brittle.
