Mr Steve Posted March 15, 2019 Share Posted March 15, 2019 Hello,I have some used S4 PARS. Some have their product label missing and the lamp burners are not marked as 750W. Is there a way to tell if these are cold mirror (MCM) or aluminium reflector (EA) by sight? Link to comment Share on other sites More sharing options...
gyro_gearloose Posted March 15, 2019 Share Posted March 15, 2019 I don't know if you can tell which is which from external appearance alone, but if you take the lamp out you should be able to see which type of reflector your S4 PARs have got. The MCM reflector is glass, and the fixture is only meant to have 575W lamps fitted. The EA PARs have aluminium reflectors, and are rated to 750W. Hope this helps. Link to comment Share on other sites More sharing options...
MrBoomal Posted March 20, 2019 Share Posted March 20, 2019 I always assumed the MCM' s had a plain aluminium heatsink with the 750's having a black heatsink. Link to comment Share on other sites More sharing options...
Tomo Posted March 20, 2019 Share Posted March 20, 2019 I always assumed the MCM' s had a plain aluminium heatsink with the 750's having a black heatsink.Correct. The reflector of an MCM gets extremly hot (the heat has to go somewhere!), so cannot be painted. An EA doesn't, so is. Link to comment Share on other sites More sharing options...
Mr Steve Posted March 20, 2019 Author Share Posted March 20, 2019 Thanks guys. Makes sense. Link to comment Share on other sites More sharing options...
sunray Posted March 20, 2019 Share Posted March 20, 2019 Generally black non shiny heatsinks aremore efficient at cooling than shiny silver. That's why dark cars are hotter than light cars and more efficient aluminium heatsinks are usually anodised black. Link to comment Share on other sites More sharing options...
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