Great value for the price but not for long term use more for short term experiments and in expensive co-ops
I ordered 50 of these bulbs for a co-op class of 24 students (2/student plus a couple extra). The bulbs worked great and were very reasonable in price. I'm glad that I ordered a couple extra because one student screwed his bulb too tightly, and it came apart. (Another student had extra batteries of his own and ended up burning out his bulb, a good lesson opportunity.) One bulb did have some solder on the threads that prevented it from screwing into the holder, but I was easily able to scrape it off.