I was somewhat concerned with the prospect of the Mylar being affected from the heat of my fluorescent tubes (melting), so I did some research. I found that the melting point for Mylar is 489° F, it retains good physical properties up to 302° F (maximum service temperature), and can be used up to 392° F. For an experiment, I measured the heat of an incandescent bulb in my house and it was 500° F, so I placed some scrap Mylar on it and in started to melt. I then measured the temperature of my fluorescent bulbs, and they are 130° F. I wedged some scrap Mylar on one of the tubes for a hour and didn’t see any evidence of the Mylar being affected by the heat.