Foveon Reds that aren't Red - is there a Fix?

[xpatUSA]

The LED light spectrum is not at all what I would have imagined. Downright weird. Any white light LED curves I've seen have more or less equal strength R-YG-B spikes, not the smooth curve that is heavily biased towards the shorter wavelength. The left side of the graph makes sense, but not the right. I had expected something like:



They must be using some interesting phosphors in the mix.

Earlier "white" LEDs actually had 3 separate LEDs in one package, thereby giving a good impression of white light but not emitting anything close to daylight. Other LEDs have a single blue emitter and a yellowish broadband phosphor coating, which explains my spectra posted above.

I believe that modern macro "flash" rings use that kind.

Make sense?

Ted

[Manfred M]

Earlier "white" LEDs actually had 3 separate LEDs in one package, thereby giving a good impression of white light but not emitting anything close to daylight. Other LEDs have a single blue emitter and a yellowish broadband phosphor coating, which explains my spectra posted above.

I believe that modern macro "flash" rings use that kind.

Make sense?

Ted

That makes sense and explains the blue spike. Obviously the operating environment in the LED is far less "harsh" than in a fluorescent tube, so the choice of phosphors should be a lot wider. That likely explains the nice curves rather than the spikes we see from gas discharge lights. Now if they can fix the gap between the blue and green we might have a winner from a photography standpoint.

[xpatUSA]

One glaring omission in Sigma's Photo Pro is the provision of RGB numbers is you move the cursor around (unless I failed to find the relevant setting). Unlike ACR 4.2, where it's right there at top right, or in PSE 6 where you set one of the views to show RGB and even hue, saturation, brightness in that same little view.

I'm beginning to wonder if the omission is deliberate! Know what I mean, nudge, nudge?

Ted