Fog Lights - 9006/HB4 CREE Q5 LED 5W

I tried baking one of them last night at 265* for about 7 or 8 minutes and tried to pry the glass lens off, it would come up a little but just didn't want to let go and as soon as I let go it went right back into place. After searching the internet and seeing how other people have done glass lens removal I found one that placed the housing on wet towel on a cookie sheet at 350* but didn't say for how long. Maybe I'll give it another go today. I'm certain the glass and metal can handle higher temps than the plastic headlights.