OK, I've let some of you know of my second impulsive purchase (the first being an Elwood 8x10 I still have to pick up- I will, I promise, Frank).
I found some GE 300W PS35 E39(mm) mogul lamps, internal frost, 130 V, 2500 hours. (9-3/8" long, 4-3/8" wide).
At 120 V they'd last longer and draw less power. (I don't think it's linear due to different temperature.I think I read 267 W on some site, not sure). The opal ones that big are what are tough to find.
The Elwood 8x10 Commercial manual has a discussion (and patent number) about different reflector shapes and which types of lamp coating (frost or opal) work with which. According to them, internal frost works fine with their ellipsoidal reflector...but I don't know whether they made different shapes over the years. I have seen different pictures. Some look more 'pagoda-like'. Maybe they are the ellipsoidal ones, wider, sharper angle than the paraboloidal ones. This suggests a different reflector shape to me.
Some seem to be wider than the bellows, some are not. Manual says spun copper. Others tell me aluminum. Obviously things changed over the years.
So the big question is, who among you has experienced even illumination (with the intact sandblasted diffuser) on an Elwood with internal frost lamps?
I've heard some good and some bad.
I may be selling them on eBay for street lights or greenhouses, or ...
Oh yeah, that was impulsive buy #2 - a case of the internal frost ones:confused:
Thanks
I found some GE 300W PS35 E39(mm) mogul lamps, internal frost, 130 V, 2500 hours. (9-3/8" long, 4-3/8" wide).
At 120 V they'd last longer and draw less power. (I don't think it's linear due to different temperature.I think I read 267 W on some site, not sure). The opal ones that big are what are tough to find.
The Elwood 8x10 Commercial manual has a discussion (and patent number) about different reflector shapes and which types of lamp coating (frost or opal) work with which. According to them, internal frost works fine with their ellipsoidal reflector...but I don't know whether they made different shapes over the years. I have seen different pictures. Some look more 'pagoda-like'. Maybe they are the ellipsoidal ones, wider, sharper angle than the paraboloidal ones. This suggests a different reflector shape to me.
Some seem to be wider than the bellows, some are not. Manual says spun copper. Others tell me aluminum. Obviously things changed over the years.
So the big question is, who among you has experienced even illumination (with the intact sandblasted diffuser) on an Elwood with internal frost lamps?
I've heard some good and some bad.
I may be selling them on eBay for street lights or greenhouses, or ...
Oh yeah, that was impulsive buy #2 - a case of the internal frost ones:confused:
Thanks