They are great. They last a lot longer than I thought. If they do not hold you, then most likely it is about installing a lamp. The light fixture needs to have good airflow or it will burn out pretty quickly. With open lights there should be no problems. However, if you have built-in lighting, make sure you aren't blocking the airflow in the attic with insulation or anything like that. I have 27 recessed lights and 5 outdoor lights with these bulbs. For over 2 years, not a single outside airβ¦