Quote Originally Posted by polyglot View Post
More likely is that the switching regulator built into the bulb failed. High quality regulators are quite expensive, it's the reason you can get generic $5 LED bulbs from China but a good Philips unit is still many tens of $.
Yep. These are $3. Others have had good luck with them and I probably got a bad unit. I ordered two more, as I said. However, if one of them fails in a few months, I won't order any more. I have enough standard safelight fixtures and spare filters to last me probably as long as I'm going to want to do this.