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Author Topic: What would be the difference between 70 amps through a 1.6 k and a 3k lamphouse? Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 01-10-2010 09:47 PM                     What would be the difference between 70 amps through a 1.6 k cinemacanica x16 and a 3k Eprad lamphouse? Whould there be a noticable difference?  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 01-11-2010 12:26 AM                     Depends on what mirror is being used. Glass mirrors are more light efficient (in theory at least). Cinemeccanica should have a standard metal mirror or a cold light metal mirror (cold light more light efficient). Demetris  |  IP: Logged Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 01-11-2010 12:40 AM                     I guess what I was asking is that 70 amps is as bright as 70 amps is no matter what bulb is used in theory, within there published range. Thankyou for your reply Demetris  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 01-11-2010 02:17 AM                     Actually no! For example if using the Ushio High efficiency range, 70Amps are brighter than the standard UXL or CXL lamps. The same goes for the Osram although I would recomend Ushio. Ushio High efficiency can really blind you! Demetris  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-11-2010 06:35 AM                     The 3 K Eprad is amazingly innefficient! The mirror in it can be replaced with a Super Lumex mirror by cuttinmg the hole in the dividing wall slightly larger to accomodate it. I've done many of these mods. Then you have a fairly decent lamphouse. Parts for the EPRAD are non-existant also...  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-11-2010 10:37 AM                     My experience with the universal eprad is that it was a very efficient lamphouse and we used a lot of them at one point for one circuit As for parts most are off the shelf standard items  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-11-2010 12:48 PM                     It WAS considered efficient in the late 1970's when it came out. The unfortunate thing is that the EPRAD doesn't even hold a candle to the Super Lumex. Installing a Super Lumex reflector which is a fairly easy thing to do and is still an off the shelf part as well... for the EPRAD will get you about 36 to 38% more light on the screen as well as alot flatter illumination field. The EPRAD igniitor was always reliable. Almost all of them in this area have been pulled from service in favor of much more efficient lamphouses so if you need any more of them just let me know. Mark  |  IP: Logged Mike Croaro Master Film Handler Posts: 394 From: Millbrae, CA Registered: Apr 2005 posted 01-11-2010 06:43 PM                     Hi Folks: I think I know what Cameron is trying to say is: Example - three different wattage lamps: 2000 60-84 amp range 2500 70-92 amp range 3000 60-110 amp range. If you run each lamp at, lets say, 80 amps, will you have the same brightness, as the 2000 would run very high, the 2500 in the midrange, and the 3000 down low. Assume each lamp is the same brand and style. Make sense? Mike  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-12-2010 09:24 AM                     Actually you would not have as much light from a larger lamp run at a lower current due to the electrode design and arc concentration what you do get is longer lamp life typically  |  IP: Logged

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