Somewhat relative... I installed the laminix covers on my wifes '07 Fozzy and they burnt the first winter. I think we had winter mountain road sludge build up that helped retain too much heat behind the film - nice brown spots on both.
stock wattage (actually stock bulbs in that car)
I run Hella yellowstar bulbs (~$6ea) in my Leggy fogs - looks good (pretty yellow) and throws an obviously yellow light compared to the headlights, esp on snowy roads. sorry no pics...