Helen c Posted May 6, 2008 Share Posted May 6, 2008 Hi,Just wondering, I have recently ordered some new glasses, one set with normal lenses and onc set of reactive lenses. The reactive lenses are suppsed to only react to UV light but I was wondering, anyone know if normal stage lights kick out UV?Purely for curiosity as, if need be, I have a set of normal glasses lenses on order! Helen c Link to comment Share on other sites More sharing options...
markdornan Posted May 6, 2008 Share Posted May 6, 2008 Something like 1 or 2% of the output of tungsten halogen lamps is uv, and most of that is stopped by the glass of the lamp and the lens. Don't know what effect that would have on your glasses though. Mark Link to comment Share on other sites More sharing options...
timtheenchanteruk Posted May 6, 2008 Share Posted May 6, 2008 reactions aparently don`t work in cars (at least not properly) so I would think that the chance of any reaction would be unlikley Link to comment Share on other sites More sharing options...
MacTheLight Posted May 6, 2008 Share Posted May 6, 2008 Experiment results. For the last hour, my photoreactive glasses have been 1m in front of a 500w fresnel @ 100%. So far they are getting warm but not going dark. :unsure: However, even in the clear state they have a slight but noticeable tint to them. Mac. Link to comment Share on other sites More sharing options...
David Lee Posted May 6, 2008 Share Posted May 6, 2008 The reactive lenses are supposed to only react to UV light Anybody tried them in front of a UV cannon? Certainly wondered if it would be worthwhile buying them myself (reactive glasses that is - not UV Cannons). Link to comment Share on other sites More sharing options...
dosxuk Posted May 6, 2008 Share Posted May 6, 2008 Mine don't change in our venue, even when stood underneath 2 400W UV cannons. They do however get a noticable yellow tint to them when stood in rooms with flourescent tube lighting for long enough. Link to comment Share on other sites More sharing options...
timtheenchanteruk Posted May 6, 2008 Share Posted May 6, 2008 IIRC the "visible" UV is the wrong type of UV for the reactive lenses, the correct type of UV is given out in small amounts by normal florries Link to comment Share on other sites More sharing options...
marque51 Posted May 6, 2008 Share Posted May 6, 2008 dont know about reactive lenses but I had mine coated with an anti reflective coating which certainly made an improvement. no more blurring or starry effect Link to comment Share on other sites More sharing options...
gherriott Posted May 6, 2008 Share Posted May 6, 2008 can add to the list of 'no reaction under stage lamps' section as I have had mine for some time and never had a problem with them. As you know glass will not let UV through, unless it has been specially coated such as in UV cannons, which is why there is no reaction in your car or greenhouse! Only thing I do not like about them is the delay in changing back to normal after being out in the sun for a while. It appears to absorb the UV and light a phosphor (sp) that glows green in the dark, the more it receives the longer it takes to go back to normal again. Apart from that however, money worth spending! Link to comment Share on other sites More sharing options...
theatrcymraeglampy Posted May 7, 2008 Share Posted May 7, 2008 Has anyone tried the same experiment using a HMI? As they kick out a lot more UV radiation than tungsten Link to comment Share on other sites More sharing options...
Helen c Posted May 7, 2008 Author Share Posted May 7, 2008 thanks guys, really helpful! I suspected that stage lanterns weren't supposed to kick out UV, but as mark dornan said, I thought there could well be at least a small UV output. Thanks, really interesting. Hand't realised that they didnt work in cars or greenhouses, someting the optician probably should have mentionned me thinks! Link to comment Share on other sites More sharing options...
gyro_gearloose Posted May 7, 2008 Share Posted May 7, 2008 They do work even when they are behind two layers of plastic though! I ride a motorbike and even with both visors down (my lid has a normal clear visor and a smoked visor built in) my glasses will darken. Link to comment Share on other sites More sharing options...
timtheenchanteruk Posted May 7, 2008 Share Posted May 7, 2008 Hand't realised that they didnt work in cars or greenhouses, someting the optician probably should have mentionned me thinks! neither did I, I only found out when the optician told me as I nearly bought some a couple of weeks ago, in the end I didnt just got some sunnies instead Link to comment Share on other sites More sharing options...
Sarah Q Posted May 11, 2008 Share Posted May 11, 2008 Don't forget that the lenses will change colour even when it's cloudy, due to the UV levels.... I find it annoying when my reaction glasses are fully dark in the rain! I have to use a normal pair for driving with the anti-reflective tint... But never had a problem in the theatre! Link to comment Share on other sites More sharing options...
Ynot Posted May 12, 2008 Share Posted May 12, 2008 Hand't realised that they didnt work in cars or greenhouses, someting the optician probably should have mentionned me thinks! neither did I, I only found out when the optician told me as I nearly bought some a couple of weeks ago, in the end I didnt just got some sunnies insteadNote that it's not really recommended that you drive in prescription sunglasses as going into darkened areas (eg tunnels or shaded areas) can mean you can lose a significant portion of actual and perceived vision. But on the OP's question, no - I've had recative lenses for years with NO effect from standard stage elecs. I do have some unusual effects from the UV cannons/fluoros tho - get a purple-ish dust effect on the lenses, even when they're clean... Link to comment Share on other sites More sharing options...
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