[PW] measuring the brightness of artificial lights

[BETZ-ZALL, JONATHAN]

Here's an article from Britannica online:
http://www.britannica.com/eb/article-9049341/luminous-intensity
Note the relationship between the lumen and the candela.
Here is the article on the candela, which seems to have replaced
candlepower: http://www.britannica.com/eb/article-9019949/candela

Cheerio!  Jonathan Betz-Zall, Highline Community College, Des Moines, WA

-----Original Message-----
From: project-wombat-bounces at lists.project-wombat.org
[mailto:project-wombat-bounces at lists.project-wombat.org] On Behalf Of
Solomons1pal at aol.com
Sent: Wednesday, April 30, 2008 12:06 PM
To: list at project-wombat.org
Subject: [PW] measuring the brightness of artificial lights

Colleagues,
 
   While shopping for a really bright flashlight or lantern, I've  noted
that 
manufacturers and dealers have no uniform way of indicating how  bright
their 
products are.  I've seen brightness described in at least four  ways:
lumens, 
candlepower, wattage, and foot-candles.  Is there any way of  converting

these metrics into one standard one, so that a buyer can compare  apples
with 
apples?
 
                                    Mark  Halpern



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