ALOT of heat. and yes they will melt the stone covers is that what you had? there is a warning on the page i made and also on KC's web site about that there seal beam bulbs they get HOT and fast i have accidently burned myself on them a few times...
also here is more info that it would be nice you might want to read my KC thread located HERE
so you will understand why those are hot and why the others arnt...
Ok with daylighers design the reason its such a large housing is because of the 150W daylighter is made that large for cooling the Sealed beam bulb. Now that being sayed the 150w lights are sealed beam light bulb, think back in the day with you moms old 70's LTD, you had to replace the whole headlight bulb reflector and everything. Same principle. Ok the 100W and 130W are H3 bulbs and you can just replace the bulbs. Now the 100w and 130w lights donít get as warm as the 150w. Thus why the ABS plastic stone guards and clear guard melt under the heat. These lights arenít as "big" as you may thing they will fit on any standard brush guard. The mounting bolt is fairly far back