I was curious if anyone has had any experience using tracking lights like this one advertised on ebay? I think others are advertised as "blue tracking lights".
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:I T&item=230286149269

I'm color blind and tracking is a ^%$#@. I need as much help as I can get. I certainly would like to hear if these are useful or not.