Fresnel burning through gel

[moojoe]

so I have a 6" Altman Fresnel which is burning through gel like crazy. we're running a show now, and every 3 shows i need to change it. its twofered, and the other insturment never needs to be changed, but this one keeps burning through. always in the same place too. ive saved every peice, and the gel is in the exact same place, same size. i changed lamps, and that did nothing though. does anyone know what it may be?

[mbenonis]

What number gel is the fresnel burning through, and what gel does the other fixture have in it? Are both identical fixtures with identical lamps?

[moojoe]

its R78

i have 8 other fixtures that have the exact lamp and gel, i havent had to replace one of them. the focus is also the same for the one twofered. theyre completely identical.

[jbeutt]

found your post on LN too.
If it's in the same place each time, and you're using different lamps, it sounds like a focal issue. Does this lamp have the same lense as the other? You said the focus was the same as the others. Try changing it. Mayyyybe a crack? Mayyyyybe a reflector issue?
I know it's twofered, but do you notice the lamp being any brighter than it's circuit buddy? Burning out more lamps than it should?
It really sounds like a focus issue, try changing it.

[avkid]

What kind of lamp are you using? I am assuming this is an Altman 6" die cast focus Fresnel

types for this model include:
BTL - 500W Q500 T6/CL/P ANSI BTL
BTM - 500W Q500 T6/CL/P ANSI BTM
BTN - 750W Q750 T7/CL/2P ANSI BTN
BTP - 750W Q750T7/4CL/2P ANSI BTP
BTR - 1000W Q1000T7/4CL/2P ANSI BTR

[moojoe]

BTN - 750W Q750 T7/CL/2P ANSI BTN

[avkid]

We use the same one at school, I have never had any filter life problems with these fixtures. You might try warming up the fixtures before each rehearsal and show.

[SketchyCroftPpl]

Did you try switching the two? As someone said its "circuit buddy". Maybe see if you switch the one that is burning the gels with one that isn't and see if w/e fixture is in that specific circuit is the one burning them or if its the light itself.

~Nick

[Inaki2]

I replied in LN, check the mirror and lamp alignment not causing a hotspot in the gel.

[SketchyCroftPpl]

Question. This may end up being in a better post somewhere but how exactly does the lamp burn the gel away? What process is going on? I know the gel is plastic but every gel that I've seen that was burned out, the color was just removed from that section of the gel where it was hottest. What is going on there?

~Nick