Yeah, I personally was really impressed by the light out of the
Robert Juliat LED Fresnel. Far better than I was expecting from an
LED light source in terms of color and appearance. Not sure how it plays with
gel though.... (in terms of what the color ends up being vs. a
Halogen source.)
HPL without a heatsink is called a GLC.
(more or less.) The
HPL has the filaments very tightly defined and in a square
pattern or sextagon, vs. the GLC which is a C-13D with the filaments offset and not equally spaced out. I don't think you'll see much of a performance difference though if you aren't using the
Source Four reflector, which was designed for that tightly defined
filament design. The
HPL lamp was specifically designed in concert with and for the
Source Four Reflector, so the full performance is achieved when you use them both together. I can't speak for the performance of a GLC in that
reflector. Ship- you like to experiment- find out and let us know your thoughts! ;-)
HPL/R with removable
heat-sink... you crack me up. That's on the development list alongside the Liquid Nitrogen filled FEL with
Ceramic Coil and
clear Saphire
envelope.