It is a 3 lamp + Dichroic Interference Filters
In the past interference filters were moving their position to filter more or less of the light before the mixing box.
I cannot say what's inside the 45SL, perhaps it's an additive system that has "substractive controls" for the user interface, the 3 lamps suggest that, this would be 3 high CRI warm white LED sources each filtered with dichroic filters, and each lamp would have a separate dimmer.
My guess is that this color head should reproduce very well the spectral nature of a Tungsten dichroic head, so it should be very suitable for RA-4 printing as channel crosstalk would be the standard one. Besseler is a serious thing, if they say that price this is beacuse it's a fine product for master RA-4 color printers.
For BW things are way simpler, two Rosco filters allows to make perfect prints, as Steve Sherman points:
https://www.youtube.com/watch?v=uRlq8CwVvws , so for BW a DIY LED source it's the way. IMHO.
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