Durst CLS 1840 - Need help and advice :) New Darkroom build.

reneboehmer · May 21, 2025

ic-racer said:
One thing I see different is that in my CLS2000, the lamp pre-warm does not eminate any light.

Oh ok, this might be because my PWM dimmer values are not accurate yet. Its just a random low voltage value atm.

koraks · May 21, 2025

reneboehmer said:
Oh ok, this might be because my PWM dimmer values are not accurate yet. Its just a random low voltage value atm.

Makes sense. I'd dim it down until it just ceases to glow.

gary mulder · May 21, 2025

ic-racer said:
One thing I see different is that in my CLS2000, the lamp pre-warm does not eminate any light.

Are you able to measure the temperature of the pre-warmed bulb ?

reneboehmer · May 21, 2025

koraks said:
Makes sense. I'd dim it down until it just ceases to glow.

Yes, will do this asap.

ic-racer · May 22, 2025

gary mulder said:
Are you able to measure the temperature of the pre-warmed bulb ?

I don't know. I could measure the temp of the lamp base after it has been idling a while to see if it gets any warmer.

Klaus Mähring · May 26, 2025

Fascinating build, respect!

Thodoris Tzalavras · May 30, 2025

ic-racer said:
One thing I see different is that in my CLS2000, the lamp pre-warm does not eminate any light.

When my EST2000 was still working, the lamp at pre-warm in my CLS2000 was actually emitting a very-very faint glow:

gary mulder · May 30, 2025

Maybe it’s best to use the output voltage value stated in the manual for the preliminary heating.

ic-racer · Jun 1, 2025

I’ll check mine in dim light

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