The same incident as this,
or are you being redundant, again?Well, I had that happen during a show. Only it totally blew the glass out and on to the actors who were having an intimate moment on stage, raining glass down on them. They didn't even flinch.
I can just see that. (granted I'd be one of the people who wants to) Hi everybody, today we're going to tackle a myth that 70 percent of our viewers don't care about or don't understand! granted if they could actually make some bulb blow up and break things people would still be interested. It just seems like convincing them to do it would take a little work haha.
I remember when I was first getting involved in tech theater, we had a lamp blow. The LD was up on the genie focusing lights, and he asked me to go to the dimmer rack and bump the one he was working on. After doing so, I looked up just in time to see the thing explode, red-hot glass falling out of the front of the barrel. It gave the LD a pretty big scare.
The fixture in question is a source four. It was a new lamp, so we assumed that it had been accidentally touched. Until I saw that video, I always thought a touched lamp would explode immediately.
Not an FEL, in fact, only a 500W lamp, but of the same family and one of the most interesting lamp failures I've ever seen:
from Jim On Light .
One could speculate about this with many hypotheses.
- Since in a Fresnel, the lamp burns base down, all the heat is concentrated at the end of the envelope.
- Because of the spherical reflector, all the heat is concentrated on one side of the lamp.
- The coiled-coil filament geometry doesn't suit itself well to a spherical reflector. A planar filament, such as on the BTL family, makes much more sense. But using an EHD is not unique to Kliegl; Altman used the same lamp in some of their 6"FS (65Q) for a time.
- What chemical compound would cause the yellow powder on the inside of the envelope? Sulfur?
- What caused a portion of the filament to get sucked outside the envelope?
Even the video agrees that it is less than conclusive but he certainly isn't advocating handling lamps barehanded. It may be as simple as he has very little oil/acid in his hands.I don't find the video very compelling. It seems to me there are a lot of variables that their tests didn't take into account. Everything from how clean his hands were, the heat dissipation of the particular lighting instrument, to the formulation of the glass, to the type and brand of the lamp. There are just a pile of factors that could affect the chances for catastrophic failure.
I think most people here would agree it's important to handle bulbs carefully to avoid problems.
It was always my understanding that the oil from your hands would weaken the envelope and thus make it blow sooner. I never tested that theory and may simply be one of myths of lighting. Lamps were always too expensive to test on a short budget.
The oils from your skin supposedly cause the envelope to burn hotter where you touched it. Supposedly.
Had a 575 explode in one of my s4 pars. Ive had this happen before but it has never shot through the Lens. Ideas as to why this happened? We have about 20 of them hanging over our band and i can't have these lens raining down on the band. Was told that the lamp was a Pale Bright Blue right before it happened and was a loud pop then flaming glass...
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