I use the Geismann powerchrome bulbs. They are incredibly strong. For example, I did a change out recently. I then took rocks and tried to break them in my garbage can so the lid could shut properly. I could not break them. Seriously. I tossed some softball sized chunks of cement on the bulbs. They did not break. I figured since I could not break them when I was trying that I would just let the lid close on top of the bulbs. They were there all week with the lid slamming on them and they never broke.

They are great bulbs too by the way.