Subject: Brighter quartz lamps

From: Bernadette Rodgers

Submitted: Tue, 6 Oct 1998 16:07:11 -0700 (PDT)

Message number: 314 (previous: 313, next: 315 up: Index)

There is an effort underway to make the "Bright Quartz Lamps" at APO considerably
brighter, hopefully at least 4-5 times brighter, by installing brighter bulbs.

This will only change the Bright Quartz, not the "Dim Quartz" lamps.  It is my 
understanding that the Dim Quartz are used by imaging folks and the Bright quartz 
lamps are only used for spectroscopy, for which they are not very bright at all.

Obviously, this is meant to be an improvement and to noticeably shorten the time
required for spectral flat-field calibrations.  If you have any concerns or questions 
about this pending change, please bring them to my attention: 
	rodgers@astro.washington.edu

Also, since I normally use hi-res mode with DIS, it would helpful if someone could
tell me a typical exposure time for flats in low-res mode, and the corresponding counts.  

Before a change is made, the lamps will be checked out in all (spectral) modes of DIS 
and GRIM and the results reported here.  There should be no change to the operation 
of the lamps.

Cheers,
Bernadette


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