I bought these before for the overhead projector I use at school. On my second purchase, all four bulbs blew out within 30 seconds of being plugged in. Some effort was made to take care of faulty bulbs as they were out the window for a return or exchange. The company said Revain would take care of my problem and luckily Revain agreed to work with me to send me replacement bulbs. Fingers crossed it works!
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