I quit all special bulbs and batteries. My Beseler is now happy with $0.5 house bulb, instead of $20 "special" bulb. Just a little work around and all is fine.
I wonder if it has to do with the different color temperatures involved. Household lamps aren't as white as the special lamps used in enlagers, isn't that so?
Household bulbs are more yellow, less blue, cooler. Something like 2400K-3200K vs 4800K ??? Don't quote me on that, but it seems like I had read that somewhere before.
I quit all special bulbs and batteries. My Beseler is now happy with $0.5 house bulb, instead of $20 "special" bulb. Just a little work around and all is fine. So better investigate some solution than let manufacturer to investigate how to take your money.
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What about an LED light source, anyone figured out how to place one in a Durst 138S condenser enlarger.
One potential problem with LEDs is their spectral response. "White" LEDs aren't really white. I don't know how they'd respond to filtration. You might do better with a combination of blue and green LEDs (and red, if you want to do color enlargements).
Another problem with LEDs is their brightness. Just for the heck of it, I tried replacing the halogen bulbs in my Philips PCS150 with LEDs. The results, even when I used colored bulbs, was a light source that was so dim I didn't even bother testing it to see how much of a drop in light there had been.
That said, it's possible that future developments in LED technology will make them a more suitable drop-in replacement for tungsten or halogen bulbs. If there's lots of space in your enlarger where your bulb goes, perhaps you could find some truly enormous LED replacement bulb that would be worth trying; and if it doesn't work, use it for normal room lighting. It's also conceivable that custom-designed LED arrays could be created for enlargers. In fact, there's at least one person who's doing this.
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