I know GE did for a short time make 400 watt HPS GE M-250R2s....but they stopped....also using a 400 watt MV BT lamp or MH BT lamp...you wont be able to use FCO....only drop or sag lens!
Why are all large fixtures (700-1000 watts) Have only drop lens not any FCO or anything like that? I bet there can be FCO large fixtures, I wonder why they don't make them though, they can work for 1000 watts HPS.
im not Big on FCO myself,but those Revere FCO cobraheads (which i hear are the first FCO Cobraheads) use a cool frosted glass which gives a better light distribution from the FCO optics....IMO Glare Shield over a Drop Refractor is most usable if you want the smooth distribution with the cutoff of flat lenses....i've also noticed FCO Fixtures...namely the OV-25 FCO and M400A/R3 FCO give a striped apperance to the lit pavement even though they seem to do an ok job of lighting in close enough intervals.
@ Form109; i have noticed the the dark streak as well. It gets annoying when driving on the interstates filled with M-400 FCOs (400&250HPS) and seeing the dark streak thorught the middle of the cast of light.
somehow i think the darkstreak may be present in most FCO Lumes for two reasons....one isn't there usually an indention in the reflector in the center where the lamp usually rests?....two combined with this is the lamp itself,the light reflected here is brought back through the lamps glass and gets defracted and makes a slightly darker streak than surrounding areas....thats my theory.
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I also got a 400W MH lamp to fit in my R47 before but didn't fire it up in the fixture.
They only do it because its cheaper to buy a small cobra then a medium
My area mixes FCO with drop lens and you can sometimes see the streaks under the FCO light.