stories Posted February 18, 2008 Share Posted February 18, 2008 Hi, Just want to double check my thinking: Internal a fixture will be supplying the same power/voltage etc to the lamp weather the input voltage is US 120v or UK 240v? Meaning MSD250 lamps purchased in the USA will work in a fixture uesd in the UK without any problems, correct? Cheers M Link to comment Share on other sites More sharing options...
DaveP Posted February 18, 2008 Share Posted February 18, 2008 In short .. Yes (and the internal cable sizes will be calculated for the current requirements at 120v which means they will be oversized for a like for like current / wattage calculation using 240 ish V) But.. And there's always a but... If any internal electrical component (switch / bulb holder / plate and so on) shows a rating of 120V or there is no CE mark ... then its a can of worms to use them from a liability point of view. Link to comment Share on other sites More sharing options...
stories Posted February 18, 2008 Author Share Posted February 18, 2008 Cheers for the response Dave, just need to check my thinking on was on the right lines. And just to clarifi this is in regard to using MSD 250/2 lamps purchased from the USA in a fixutre in the UK (so fixture is UK spec). In short .. Yes (and the internal cable sizes will be calculated for the current requirements at 120v which means they will be oversized for a like for like current / wattage calculation using 240 ish V) But.. And there's always a but... If any internal electrical component (switch / bulb holder / plate and so on) shows a rating of 120V or there is no CE mark ... then its a can of worms to use them from a liability point of view. Link to comment Share on other sites More sharing options...
Brian Posted February 18, 2008 Share Posted February 18, 2008 And just to clarifi this is in regard to using MSD 250/2 lamps purchased from the USA in a fixutre in the UK (so fixture is UK spec).An MSD250/2 is a 90V lamp. The job of the ballast in the fixture is to drop the incoming mains down to this figure which is why you need to make sure the taps are set correctly for your local mains voltage and frequency. Link to comment Share on other sites More sharing options...
Guest joewhite903 Posted February 19, 2008 Share Posted February 19, 2008 I know this is completly different to what You guys are acctualy talking about. But thanks Brian you have cleared somthing that has puzzling me for ages, Always wondered what the purpose off the ballast was for, I know every thing else but was never 100% as I know that the lamps are 90V. Basically its just a dummy load in series with the lamp. Just like when you want to run 2 120v Lamps off 240v you run them in series with each other. You really do learn somthing new everyday, Thanks Joe Link to comment Share on other sites More sharing options...
gyro_gearloose Posted February 19, 2008 Share Posted February 19, 2008 Basically its just a dummy load in series with the lamp. Its a bit more complex than that Link to comment Share on other sites More sharing options...
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