On Jul 3, 12:40 pm, Islander <islan...@[EMAIL PROTECTED]
> wrote:
> We have 12 Stand 6"fresnels in our inventory. Age - 10 yrs old, same
> as the rest of our inventory. This past year I am going through GE
> BTR lamps in these like crazy. I use one specific brand from our
> supplier and never had any problems with them until 2 yrs ago when we
> relamped. They all seem to blow when doing a lamp check when first
> firing up he board. They always fail with two black marks on he side
> of the glass in the middle and the filaments are rolling around in the
> glass. No finger prints on the glass. mainly cuz I use editors
> gloves to change them.
>
> I have taken to setting the patch for these dimmers to be 95% at full
> on the channel but just blew another one the other day. I have also
> set the focus slightly in from full flood on all fixtures so they lamp
> is back from a lens a bit. Still it blows.
>
> Other thing I note these lamps are getting very hard to get in and out
> of the sockets. Hard even when they were new. The difference in the
> size of the two flanges is difficult to see when in the dark catwalk.
> My maglight helps but I don't have 3 hands. <grin>
>
> Anyone else experiencing difficulties with this.??
>
> cheers
> Marv
This is the med pre-focus base version, yes? If so, I had people
install lamps for me not respecting the size of the flanges and would
twist the bulb envelope right around the socket and cause premature
failure. Also, without knowing that you must push down first before
you twist can cause the same sort of failure. The filament looked
good, but the lamp was dead. It does help to periodically use some
emery cloth on the center contact to scrub off some of the carbon
trail. Other than that and the usual precautions against touching the
bulb envelope on installation I've never experienced ongoing problems
with strand products (other than that they are generally annoying).
Any more information to share?
Ta,
Lloyd
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