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Many years ago when flipping on a cold bulb on my projector. the bulb simply exploded in the lamphouse. I believe the bulb functioned normally, previously. Since then . I always wear protective eye wear if I have the operate the bulb without the lamphouse cover. Anyone ever have this happen and what would cause this? It was DFC 150watt bulb on a B&H projector.
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You cannot touch halogen bulb with your bare hands/fingers. It is written in every box of the halogen bulb.
I don't know why but someone said that our finger prints will make the heat unstable on the bulb surface. Others may probably add to this info.
Cheers,
winberr -
This happened to me and I wrote about it here:
Exploding Eumig - 8mm Forum (film-tech.com)
It was like a gun shot and frightened me to death at the time!Comment
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It is because the grease in your sweat reacts with the quartz of the lamp envelope causing darkening and heat build up which leads to explosion due to uneven expansion. At least that's what I remember from when they were introduced.Originally posted by Winbert Hutahaean View PostComment
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Brian's correct. The oil from skin can cause a bulb to heat up, burn out and possibly explode. I've never had a projector bulb shatter like John's did, however I've had a few bulbs in film lights explode. Luckily there were safety mesh guards on the units.Comment
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I 'm sorry I forgot to specify the bulb DFC is a regular tungsten bulb.... non-halogen.Comment
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I have never had an incident with an exploding bulb, but based on the experience of John and Thomas and others, it's probably a good idea to put on a pair of safety goggles when handling any type of projector bulb, definitely so when working with high pressure Xenon, HID, film projector lamps, and any type of video projector lamp. You only need one bad incident to lose an eye.Comment
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I had it happen to me back in the 60’s. I was watching Castle Films silent 8mm Abbott And Costello Meet Frankenstein. The Monster had just come off the lab table and first sparks started to fly from his neck bolts and the DFG bulb in the projector exploded! I fell off my seat as I thought I suddenly had sound from a silent Argus projector or what I was watching became real! What a time I had getting all the glass out of the lamp house and the bulb base out of the socket. Never had it happen again thank goodness.
JimComment
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Never had a small lamp explode, but if you accidently touch it then gently clean the glass with a little IPA. In the 10 years at the cinema with three projectors running constantly every day, clocking up many hours, I have only had two explode in that time, both low hours and both replaced under warranty. In saying that its the damage they can do to the mirror. We did make a short video of changing a Xenon lamp Kinoton it was the first time he had changed one and was being rightly so.... very careful
Without doubt with all types of pressure lamps no matter how careful you are there will always be an element of risk, at the very least use eye protection
Last edited by Graham Ritchie; August 22, 2023, 11:20 PM.Comment
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Good tips about not touching the lamp. I'm very careful about not touching them with bare fingers, but the projector that my lamp exploded in was new to me with the lamp it shipped with. I had no idea how it had been treated before it came to me. In future, with any new purchases, I'm going to change the lamp as a matter of course.Comment
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That would be a waste. Just clean it with IPA if you want to make sure there's no grease on it.Originally posted by John Armer View Post
I've had a couple of times when a bulb from a digital projector ended with a bang and it's not that uncommon. The lamp housings are built to be able to withstand an exploding bulb.
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