You might also consider how to make a test as to whether there is UV in 
your environment.
I did a little research and turns out there is a little trick you can 
perform.
Highlighter markers rely on UV to make them glow.
So if you use one to write on a dark or preferably black piece of cardboard,
under non-UV you can't see anything, but under UV the lettering glows.
It would be nice to know how good a test this is under real conditions.
Maybe you want to put one in your deck of cards.
Bill
Anne Lutun via Callers wrote:
  When was the last time you got a tan at an *indoor*
contradance?
 No, this is not a joke. I got sunburned while calling this past 
 Saturday (March 3rd, in Pennsylvania).
 How is this possible? Probably a damaged metal halide bulb in the 
 community center gym where the dance was held. Apparently this is a 
 problem that occurs sporadically in gyms all over the country, as I 
 found out after a google search:
https://news.vanderbilt.edu/2004/05/19/damaged-metal-halide-lamps-can-cause…
<https://news.vanderbilt.edu/2004/05/19/damaged-metal-halide-lamps-can-cause-indoor-sunburns-56964/>
https://www.fda.gov/Radiation-EmittingProducts/RadiationSafety/AlertsandNot…
<https://www.fda.gov/Radiation-EmittingProducts/RadiationSafety/AlertsandNotices/ucm116540.htm>
 I'm very fair-skinned and burn easily, but I'm not the only one who 
 was affected — the musicians got sunburns as well, and two of them 
 have (mild) eye irritation symptoms. It's only when we compared notes 
 yesterday that we realized what had happened.
 We will all be ok, and thankfully there haven't been any reports of 
 dancers being affected — it was a large and lively crowd, and we kept 
 them moving! Other than the burns, it was an absolutely wonderful dance.
 The problem had not occurred before at this monthly event because the 
 bank of lights that we now think the culprit bulb is a part of is not 
 usually on. It was needed that night because some of the other lights 
 had burned out.
 I would like to commend the dance organizers for taking the problem 
 very seriously. Once informed, they immediately contacted the 
 community center management, who in turn promised to address the issue 
 right away.
 I don't mean to alarm anyone, but next time you call in a gym, you may 
 want to wear sunscreen!
 Anne Lutun
 Philadelphia, PA
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