Difference Between a Full Frame 35mm Negative Carrier and a Normal One?

It seems that white (warm or cool) LED lamps have a wide variety of spectra:

white led spectrum - Google Search

in some cases, that could greatly complicate the use of VC paper and filters.

Some could be very far from the response expected for the use of filters.

I might be remembering someone asking about the spectral response of VC paper, which

could be useful figuring this out. From looking at them, you might do better with the

warm white, 2700K or so, lamps, but it looks so hard to say.

I suppose someone could make ones specifically for enlarging, and that might be

needed for the PH111 replacements. But I suspect also overpriced, relative to home

use lamps. (Many are subsidized by power producers, as it is cheaper than

building new power plants. But that probably doesn't apply here.)

It seems that white (warm or cool) LED lamps have a wide variety of spectra:

 

white led spectrum - Google Search

 

in some cases, that could greatly complicate the use of VC paper and filters.

But then there are WiFi controlled true RGB 'smart bulbs'. Which could easily eliminate the need for VC filters altogether and offer a wider contrast range than is easily achievable through white-light filtering.

But then there are WiFi controlled true RGB 'smart bulbs'. Which could easily eliminate the need for VC filters altogether and offer a wider contrast range than is easily achievable through white-light filtering.

Made with R, G, and B LEDs instead of white ones. Yes, that would do it.

And some blue is pretty far out there, so yes it might extend the range.

I suppose the signal can follow the power cable in.

And then there is contrast calibration.