The Phantom Posted March 23, 2012 Share Posted March 23, 2012 Hi folks A little advice needed please. I have a followspot which uses a 240v 1000w with GX9.5 base. I was wondering would it be practical to dim this or would it cause issues with the internal fan and bulb? I'm not sure of the make of this item but is currently under investigation. Regards Link to comment Share on other sites More sharing options...
alistermorton Posted March 23, 2012 Share Posted March 23, 2012 A little advice needed please. I have a followspot which uses a 240v 1000w with GX9.5 base. I was wondering would it be practical to dim this or would it cause issues with the internal fan and bulb? I'm not sure of the make of this item but is currently under investigation. If it's a normal tungsten halogen bulb (and with that base I can't think of one that wouldn't be) then that will dim ok - are you sure the fixture has a fan, though? Link to comment Share on other sites More sharing options...
The Phantom Posted March 23, 2012 Author Share Posted March 23, 2012 Yes, its located at the top of the unit! Link to comment Share on other sites More sharing options...
david.elsbury Posted March 23, 2012 Share Posted March 23, 2012 From experience you should be fine- we used to do this with Selecon Performer Quartz followspots, which are 2500w. That said, I wouldn't recommend *leaving* it dimmed to say, 50%, but if it's a fade in and a fade out at the top and tail of the cue, should be fine. David Edit: The other option of course if you own the spot, is to have someone competent wire a seperate mains feed in for the fan, so you can dim just the lamp as if it were a normal theatrical lamp, and the fan is constantly on. Link to comment Share on other sites More sharing options...
alistermorton Posted March 23, 2012 Share Posted March 23, 2012 Yes, its located at the top of the unit! The fan may not like being "dimmed". Link to comment Share on other sites More sharing options...
The Phantom Posted March 23, 2012 Author Share Posted March 23, 2012 Thanks folks. Link to comment Share on other sites More sharing options...
J Pearce Posted March 23, 2012 Share Posted March 23, 2012 I've used a few spots that took hard for the fans and dimmed for the lamp, not unlike a VL1k I suppose.Shouldn't be too hard to wire up. Link to comment Share on other sites More sharing options...
dbuckley Posted March 23, 2012 Share Posted March 23, 2012 Just for clarity From experience you should be fine- we used to do this with Selecon Performer Quartz followspots, which are 2500w. The Selecon Performer Quartz followspots have a fan in them. Although quite old now, these limes are frequenctly seen in the New Zeland theatre scene, and I've never seen one switched, always dimmed. Link to comment Share on other sites More sharing options...
The Phantom Posted March 23, 2012 Author Share Posted March 23, 2012 http://I.ebayimg.com/00/s/MTIwNFgxNjAw/$(KGrHqJHJE4E88eURK8EBPUQ+5RE1Q~~60_12.JPG This is the follow spot. Anyone recognise the make as I don't! Link to comment Share on other sites More sharing options...
Tomo Posted March 24, 2012 Share Posted March 24, 2012 We'd also want a picture of the nameplate label (or its remains) to stand much chance of being able to identify it properly. - Even if it's a bit scuffed so hard to read, there must be a label somewhere that used to clearly say what it is and someone might recognise it from the legible parts. That said, if the fan is a direct-on-mains Universal motor type (with no internal electronics at all), then it'll probably be fine on SCR dimming.A lot of dimmable blowers are that kind of motor, and most mirrorball rotators are as well - while the rotators often won't dim, they aren't damaged either. Link to comment Share on other sites More sharing options...
jonathanhill Posted March 25, 2012 Share Posted March 25, 2012 Strand Toccata profiles had the same arrangement, a tungsten lamp in parallel with a fan, designed to be used off a single, dimmed supply. Link to comment Share on other sites More sharing options...
ramdram Posted March 26, 2012 Share Posted March 26, 2012 We have an ancient Coemar Pilota which has been wired (rewired certainly) with a 3phase plug and socket arrangement so that the "undimmed" power arrives via one pin and the dimmed power on another pin from a single channel fader (pro' yet an inescapably homebrew looking job) bolted to the yoke. Uses 32A cee connectors (red plastic for those not au fait with such kit) and, seeing as they are the only 32s on site, reasonably safe from someone doing something silly...and they only get shared to our sister companies. (It must be said that the 2kW lamp really does need a fan. Nice to work with on a cold evening but a total sauna if we get a hot Cornish evening. The exhaust gets blown vertically up and the downside is the canopy over has been known to get almost too hot to touch. I wonder if we have that covered in the RA?) Link to comment Share on other sites More sharing options...
dbuckley Posted March 26, 2012 Share Posted March 26, 2012 Assuming that the fan and lamp are powered from the same single phase supply going into the dimmer, that ceeform connector should be blue. The colour isn't down to the number of phases (and thus pins) but to the voltage. Link to comment Share on other sites More sharing options...
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