Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

I was able to use the Dremel diamond bit to bevel some AN glass I cut down from 5x7 for my 4x5 enlarger. I do have a spare reflector and believe I would be able to enlarge the opening with that Dremel bit.

Attachment 201401
Attachment 201402

Seems like a manageable task to undertake albeit slowly and not being to aggressive with it. My next question is to ensure that the G38 Mogul bi post pins will work. I will probably have to pull my bulb and make some measurements. Below is the specifics of the bulb I am looking at.

Attachment 201403Attachment 201404

Not that one. It is FTL that will fit the socket as the COLAMP2000. See how the two pins are different sizes:
https://www.interlightus.com/light-bulb/FTL

I bought one of those FTL lamps about ten years ago, but I can't find it now. Maybe I sent it back when I found it did not fit through the reflector.

Quote:

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Originally Posted by ic-racer

Not that one. It is FTL that will fit the socket as the COLAMP2000. See how the two pins are different sizes:
https://www.interlightus.com/light-bulb/FTL

I bought one of those FTL lamps about ten years ago, but I can't find it now. Maybe I sent it back when I found it did not fit through the reflector.

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Thanks for the info. Any idea of the diameter of these bulbs?

This are specs for COLAMP 2000 that I used when was playing with producing new ones:

type Projection Lamps
Length 140 mm
52000 lum (4141 cp)
Col.Temperature 3200 K
Voltage 240 or 220/230V
A 9.09 A (220V)
Av.Life 300H
Filament CC-8
40 x 7.5 (H x W)
Glass Diam 13/8 "

Base GY 16 2-pin
Light Center Length 3.35 inch (85 mm)
Maximum Overall Length 5.71 inch (145 mm)

Maybe that helps somebody.
Check focal point and filament size or reflector wouln't work correctly.Attachment 201421

Quote:

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Originally Posted by Chuki

This are specs for COLAMP 2000 that I used when was playing with producing new ones:

type Projection Lamps
Length 140 mm
52000 lum (4141 cp)
Col.Temperature 3200 K
Voltage 240 or 220/230V
A 9.09 A (220V)
Av.Life 300H
Filament CC-8
40 x 7.5 (H x W)
Glass Diam 13/8 "

Base GY 16 2-pin
Light Center Length 3.35 inch (85 mm)
Maximum Overall Length 5.71 inch (145 mm)

Maybe that helps somebody.
Check focal point and filament size or reflector wouln't work correctly.Attachment 201421

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My bulb length checks out close to yours (just shy of 4" from the end of the bulb to the beginning of the white ceramic base) but the bulb diameter spec of 1 3/8" listed above for the COLAMP 2000 listed above seems wide to me and at this diameter this bulb would not fit into my reflector as I see it. My halogen bulb has a diameter of 0.9". I can also see how only about the top half of the halogen bulb physically goes "into" the reflector on my unit but I guess it gets the job done.

Colamp2000 are about 26mm in diameter and the hole in the reflectors about 32mm. The FTL bulges to about 36mm in the middle (see below). So it is very close, not much glass would need to be removed from the reflector.

Going back through this thread it really amazes me how time flies. Posts from 2009 seem like yesterday.
Anyway I did find one of my FTL (CP43) 2000W lamps I got in 2009 and it does indeed fit in the hole in my reflector without enlarging the hole.
So, it looks like there were two different versions of the FTL, one with the bulge and one without.

What I cannot answer right now is if the FTL (CP43) without the bulge is still in production.

The picture below shows two different FTL (CP43) lamps from different sources. Top one is 36mm, the bottom one is 26mm.

Attachment 201698

Attachment 201703

Potential substitutes for Colamp2000

Attachment 201721

Attachment 201720

I have a Coolamp and/or Thorn, if you are interested?