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

  1. #631
    ic-racer's Avatar
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Optional CLS2000 Air Extractor Hose:
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    The hose directs the hot air away from the enlarger, for worker's comfort. Otherwise the hot air just comes out the rectangular opening at the rear of the lid.

    Don't confuse the CLS2000/1840 hose with the LAFAN. The LAFAN was a blower unit that directed cold air into the Condenser head when using higher wattage opal lamps. One would not want to connect a LAFAN to the CLS2000 exhaust hose.

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  2. #632
    Drew Wiley
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Duplicate post

  3. #633
    Drew Wiley
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Any supplementary system should PULL air out and away from the housing, to be vented outside and thus prevent temp buildup of ambient air around the colorhead. Recommended. Equip lasts longer, risk of hue shifts due to overheated filters is reduced, room comfort improved, etc. A suitable heat-resistant hose and inline squirrel cage fan doesn't necessarily have to come from Durst; any AC supplier like Grainger will have a more affordable selection.

  4. #634
    ic-racer's Avatar
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    I just acquired a CLS 1840 enlarger... How do I check if it already has a blower motor in there.
    The blowers on the CLS2000 are pretty loud, hard to miss. Like two hair blow-driers.



    Could I have a higher wattage bulb requiring this configuration?
    Check you bulb. It should be a 1000W 120V Colamp1840 like this.


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    The 2000W Colamp2000 (Thorn HX27) takes 220V.
    Last edited by ic-racer; 15-Jan-2020 at 16:23.

  5. #635
    Drew Wiley
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    2000 watts of halogen is a LOT of heat. An effective exhaust system should be a high priority. Reminds me why I replaced my 2000W Durst head with my own design which runs cooler. Of course, 2000W is extreme overkill for anything less than mural work, so interchangeable lower wattage bulbs might be a wise option. And again, Durst is not the only source for such things. Photo suppliers are likely to be far more expensive than an overall specialty bulb supplier.

  6. #636

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

    Quote Originally Posted by Drew Wiley View Post
    2000 watts of halogen is a LOT of heat. An effective exhaust system should be a high priority. Reminds me why I replaced my 2000W Durst head with my own design which runs cooler. Of course, 2000W is extreme overkill for anything less than mural work, so interchangeable lower wattage bulbs might be a wise option. And again, Durst is not the only source for such things. Photo suppliers are likely to be far more expensive than an overall specialty bulb supplier.
    Thanks Drew and ic-racer. This information is very helpful. The wall power plug that I had an electrician put into my darkroom for this enlarger I believe is 220V which conveys to me that I have a 2000 watt halogen. Is it possible to change out to a 1,000 watt halogen bulb? I will check later today as to the bulb and the blower. I have not yet fired up the unit because I am taking the time to figure things out properly.
    Last edited by Michael Kadillak; 15-Jan-2020 at 16:26. Reason: typo

  7. #637
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Quote Originally Posted by Michael Kadillak View Post
    Thanks Drew and ic-racer. This information is very helpful. The way power plug that I had an electrician put into my darkroom for this enlarger I believe is 220V which conveys to me that I have a 2000 watt halogen. Is it possible to change out to a 1,000 watt halogen bulb? I will check later today as to the bulb and the blower. I have not yet fired up the unit because I am taking the time to figure things out properly.
    The 1000W Colamp 1840 will likely fry in an instant at 240V! I don't think it will fit in the socket anyway.

    Why do you think it is too bright, The CLS2000 is only one-stop faster than the CLS1840. In any case you can set the density knob to 30 and have the same output as the CLS1840.

  8. #638
    Drew Wiley
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Yes, if you identify the specific bulb contact profile, and select an equivalent bulb of lesser wattage, but of the same voltage and burn position. Again, checking with a specialty online bulb house if the best way to do that. There are a number of such suppliers. Those original Durst bulbs were mighty expensive. Remember to handle them with gloves, lest one instantly blows up from finger oil. When inquiring, you need to know the actual designated bulb classification to identify the same class and fit of bulb of lesser wattage. "Colamp" was just a Durst marketing term for something else. It should be imprinted somewhere on the base (nearly legible in the posted picture).

  9. #639
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    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Quote Originally Posted by Michael Kadillak View Post
    Thanks Drew and ic-racer. This information is very helpful. The way power plug that I had an electrician put into my darkroom for this enlarger I believe is 220V which conveys to me that I have a 2000 watt halogen. Is it possible to change out to a 1,000 watt halogen bulb? I will check later today as to the bulb and the blower. I have not yet fired up the unit because I am taking the time to figure things out properly.
    Did you start a thread on your enlarger? Otherwise, pictures please, post them here! One little mistake plugging things in wrong could lead to tears!
    All the L1840 power supplies take a 220V input, irrespective of lamp voltage (120V), shutter voltage (24V), Fan voltage (220V) etc.

    You should know what you have, one can't miss the bold letters "CLS 1840" or "CLS 2000" on the front of the lamphouse.

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  10. #640

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

    Below are some pics of my Durst CLS 1840. the enlarger front, the front of the power module, the top box which has a connector bolted to the top and an opening in front as well as the blower motor. I looked at the top of the light head and did not see how to get the halogen light out but it looks pretty big.



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