Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!silver!commgrp
From: commgrp@silver.bacs.indiana.edu
Newsgroups: sci.electronics
Subject: Need quartz-halogen lamp info
Message-ID: <7200047@silver>
Date: 2 Jan 90 21:59:00 GMT
Organization: Indiana University CSCI, Bloomington
Lines: 24
Nf-ID: #N:silver:7200047:000:881
Nf-From: silver.bacs.indiana.edu!commgrp    Jan  2 16:59:00 1990




I am looking for references and formulae for light output and color 
temperature vs. filament life for tungsten-halogen lamps, in terms of 
percent of rated voltage and lifetime.

I want to use (relatively inexpensive) 12-volt automotive quartz-
halogen bulbs in portable (dc) configuration where I need maximum 
illumination.  Automotive bulbs are designed for long life in a high-
vibration environment, leading me to believe that I can increase the 
voltage substantially and trade-off bulb life for extra light. (I can 
minimize thermal shock by increasing the voltage above rated value 
after the filaments are already hot.)  

Is it desirable to heat-sink the bulb base or to protect the lamp from 
wind?

Thanks in advance-- e-mail replies don't always go.
--

Frank Reid     W9MKV     NSS 9086     reid@gold.bacs.indiana.edu
P.O. Box 5283
Bloomington, Indiana 47407 USA