? on ultra-bright LED

Saw some of these
http://www.logical-lighting.com/pdf/LEDHPModuleWhitePDF.pdf at the local
electronic candy store, and used a couple to build a small battery-powered
emergency lantern. Trouble is it gives my wife stabbing pains in her eyes
to be around it while it is turned on (but not me...) One person suggested
it might be pulsing, like fluorescent lights, some of which do the same
thing to her. I scoped the power going into it and *that* does not seem to
indicate pulsing. Am in the process of building a phototransistor detector
to see if the *light* pulses. This thing is really bright, but it doesn't
bother me at all. Am wondering if it puts out some frequency on the high
end that is jabbing her optic nerve. If anyone has any ideas as to how to
troubleshoot this, I would love to hear form you. Ideas on something I
could use as a diffuser are also welcome...

Here is a data***-

http://elitesupply.net/product_info.php?products_id=23

Any ideas on what the square graph at the bottom means? Does it have
something to do with the frequency of output, or is it just an indicator of
usable viewing angle?

Many thanks,

Dave


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