T
Travis Evans
- Jan 1, 1970
- 0
This is largely meant to be a follow-up of I.N. Galidakis's first post
in the thread I started two months ago, which no longer appears to be on
my news server (or else I would have followed up normally).
Regarding argon flashes in HPM lamps--these would be reddish or
purplish in color, wouldn't they? Some time after the original thread I
had obtained a HPM fixture and think I saw some of these on about three
occasions so far during warmup (out of probably a couple hundred or so
starts). The first two were very weak reddish flashes which were so
brief and subtle I almost didn't notice them. A little earlier today it
happened a third time, but it was a bright, unmistakable purple flash
that lasted about half a second. The ballast hum even changed pitch
momentarily during this flash.
As far as funny behavior of Sodium in MH lamps goes--I wonder if this is
what happened on two occasions with my MH lamp (again, out of probably
around 200-300 starts or so) when instead of the usual dim grayish blue
glow immediately on switch-on I got a somewhat brighter, distinct
orangish white very much like the color from a typical incandescent
lamp. This lasted about 20-30 seconds or so before turning into the
usual clear-mercury-like color of mid-warmup and proceding through the
remainder of the warm-up period as normal. Sadly, it didn't occur to
me to grab my homemade “DVD-in-a-cardboard-box†spectroscope to check it
out before it was too late.
While I'm at it, I have a Lights of America S68 HPS lamp. I notice that
any time (I can always reproduce it) I turn it on when cold (i.e., full
warmup) and then turn it off again after only a couple of seconds, the
arc tube gives off an interesting faint blue-violet afterglow that lasts
for some time, sort of like the afterglow from high-persistence
phosphors. It seems to become less blue and more violet as it fades,
though that may just be me. If the lamp is on for longer than a several
seconds when switched off, I don't get any glow; if I leave it on longer
than this, I just get the usual orange-hot incandescent glow. Just
curious what this was. I found a couple of topics discussing similar
things but don't know if they are at all related:
http://groups.google.com/group/sci....read/thread/bddcb99278b34fcd/cd0211e46ebc0372
http://groups.google.com/group/sci....read/thread/5c0f030a9d4139e0/aa04a026c063acec
in the thread I started two months ago, which no longer appears to be on
my news server (or else I would have followed up normally).
Regarding argon flashes in HPM lamps--these would be reddish or
purplish in color, wouldn't they? Some time after the original thread I
had obtained a HPM fixture and think I saw some of these on about three
occasions so far during warmup (out of probably a couple hundred or so
starts). The first two were very weak reddish flashes which were so
brief and subtle I almost didn't notice them. A little earlier today it
happened a third time, but it was a bright, unmistakable purple flash
that lasted about half a second. The ballast hum even changed pitch
momentarily during this flash.
As far as funny behavior of Sodium in MH lamps goes--I wonder if this is
what happened on two occasions with my MH lamp (again, out of probably
around 200-300 starts or so) when instead of the usual dim grayish blue
glow immediately on switch-on I got a somewhat brighter, distinct
orangish white very much like the color from a typical incandescent
lamp. This lasted about 20-30 seconds or so before turning into the
usual clear-mercury-like color of mid-warmup and proceding through the
remainder of the warm-up period as normal. Sadly, it didn't occur to
me to grab my homemade “DVD-in-a-cardboard-box†spectroscope to check it
out before it was too late.
While I'm at it, I have a Lights of America S68 HPS lamp. I notice that
any time (I can always reproduce it) I turn it on when cold (i.e., full
warmup) and then turn it off again after only a couple of seconds, the
arc tube gives off an interesting faint blue-violet afterglow that lasts
for some time, sort of like the afterglow from high-persistence
phosphors. It seems to become less blue and more violet as it fades,
though that may just be me. If the lamp is on for longer than a several
seconds when switched off, I don't get any glow; if I leave it on longer
than this, I just get the usual orange-hot incandescent glow. Just
curious what this was. I found a couple of topics discussing similar
things but don't know if they are at all related:
http://groups.google.com/group/sci....read/thread/bddcb99278b34fcd/cd0211e46ebc0372
http://groups.google.com/group/sci....read/thread/5c0f030a9d4139e0/aa04a026c063acec