Maddison Posted March 2, 2008 Share Posted March 2, 2008 Does anyone know how much cooler the CP88 lamp is than the CP62? A practical (street lamp) needs a light source near a large amount of perspex. A CP 62 bubble would be ideal, but I fear too warm, and the poor chappie stood underneath the lamp singing might get dripped on somewhat. The song last 6 minutes (aprox) and I think that would be pushing it... I've never used the CP88's so don't know how they differ in temperature. Otherwise I can probably squeeze a mimim or something in... Link to comment Share on other sites More sharing options...
Biskit Posted March 3, 2008 Share Posted March 3, 2008 Does anyone know how much cooler the CP88 lamp is than the CP62? I don't have any figures etc (perhaps you could approach GE/Phillips or other lamp manufacturers) but having used CP88s before I can assure that they do get quite hot. As you say, perhaps not as hot as the 1k version, but I'd say hot enough to keep away from perspex etc, especially if it is above people. To be honest I try to keep them off as long as possible before focussing, exactly like the 1ks and any other lanterns, to give you an idea. Just thinking also... even small lanterns such as Minims also get quite hot... a Minim is smaller than a Par64 can, and less well vented, so with a 500W lamp will probably get too hot even faster than a CP88. Do you have any other options? I assume it is simply a visual key light rather than the primary source of facial or scenary light? If so, could you get away with something less controllable (but cooler)... I heard of some compact flourescents recently which are dimmable down to about 5%. Not absolutely ideal but if you can tollerate it, it will save you a lot of heat problems! There could also be an LED solution... lots of high-brightness white LEDs run through a transformer and on a standard dimmer (probably with dummy load) could work quite well, come to think of it. Put a heavy diffusion and appropriate gel in front and it would look great! Depends how much effort and time you want to invest! Ben. Link to comment Share on other sites More sharing options...
andy_s Posted March 4, 2008 Share Posted March 4, 2008 might be worth researching the melting point of perspex - I know the old parcans get quite hot, but I'd be surprised if it melted unless it was actually touching the unit. I'd be interested to hear if anyone knows different.... there is the (apocryphal) story of the actress buried up to her neck in sand for a Samuel Becket play, beautifully backlit by a semi circle of parcans from about 8 feet away who had to be taken to A&E with heatstroke.... OK - some hours later - the melting point of Perspex is 130 - 140 degrees C. the self ignition temperature is 830 - I assume also deg. C, the website didn't specify). Link to comment Share on other sites More sharing options...
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