I'm not attempting to answer the question or muddy the waters. Hopefully the debate/discussion will go on further given I didn't do much below. I'm hoping it further sparks noting stuff and debate if not a
fixture shoot off and more clarification.
Below is all rough estimation on my part.
In going back to the questions, a
Strand fixture optically speaking is no slouch of a lighting
fixture. It’s well known no matter what era to be a darned good
fixture. With a FEL... that’s just bulk lighting with some extent of it getting out the
gate.
Outshoot..... pull up in a search of the forum the letters HPR. This amongst past discussions of FEL lamps, #6982P lamps
etc.
Could as mentioned be a
lens or
bench focus thing but as also mentioned, also the 120v
HPL lamp is operating in a condition under it’s rated
voltage thus the luminous output and
color temperature drop while it’s lamp life goes up. (Gonna last a really long time.) A 120v long life lamp is even more so in already having less output. Overall, such a
HPL 575w/120vX lamp should be considered for an architectural install (
lobby lighting) only and consider it about as powerful as a 375w/115v extended life
HPL realistically. Pick one or the other extended life or 120v for a S-4
fixture, or up the wattage in keeping both than deal with the amber
shift in a
HPL 750w/120vX in hoping for similar output to a 575w lamp at a much lower
color temperature. Again, gonna last forever but most likely won’t be as bright in
color temperature as the FEL.
Lots of times
color temperature will confuse the eye into thinking it’s more illumination - don’t look persay at how blue/white the light appears to be, more look at the coverage and
intensity of the beam.
So, in the initial question... yep, if you used a
HPL 575w/120vX lamp in a S-4 verses a FEL (aak!) in the
Strand, the
Strand I would tend to think outshoot the S-4. If radial
Leko, a
EGC would be almost about as bright as a
HPL 575w/120vX overall in a shoot out given well bench focused fixtures, and the EGG to be a brighter with even more output. That’s my estimation in taking into account the huge hole in the
reflector and less efficient lamps. The 750w EGG might match up to a say
HPL 575w/115vX by way of slightly less output is my guess.
If FEL verses
HPL 575w/115vC, it should be a balanced fight to some extent given
Strand vs.
ETC. The
ETC with this lamp should eek out more light given the FEL, but loose out against a HPR or #6981P.
Back again to the original question, in mixing the S-4 using a
HPL 575w/120vX lamp with a
axial series of
Leko, I might match it up with a EHD lamp given the
Strand fixture. Should be fairly close
fixture to
fixture, or perhaps a GLA but the GLA should out punch the
HPL. The G.E. #37404 HX-603 575w/120v is the only real similar lamp but it’s long gone in being discontinued. Nothing available in the FLK/HX-600 type lamps that are long life and 120v these days. A long life FLK/LL (a non-ANSI lamp) or HX-601 might if the EHD is not similar enough would be the next choice for a matching lamp to the
HPL 575w/120v/X, otherwise a HX-400 would possibly match up also. Lots of variation in
filament efficiency, lamp life,
color temperature and overall output to factor in.
Hope I didn’t confuse or it helped. Refine the question perhaps more, are you attempting to match the Strands to the
HPL 575w/120vX lamps or attempting to get a lamp for the S-4 that will match up to the despised FEL lamp? This or are both available for swapping out say in balancing lamp life with output between them?
Beyond this, quick and simple... use the more dim/amber light for the amber light, the blue one for the blue lighting.