...The GLD has a more robust looking
filament but only seems to come in 750w. ...
Each three-letter
ANSI lamp code refers to only one wattage, output,
color temperature, and life. Some very minor performance variations among manufacturers.
Code, Watts, Volts, Life, Lumens
JCV120V-1200WCH, 1200, 120, 200, 33000*
FEL, 1000, 120, 300, 27500
FCV, 1000, 120, 300, 26500**
GLD, 750, 115, 300, 19000
EHF, 750, 120, 300, 20400
*Referenced in post#2.
**The inside frosted FCV will not yield desirable results in a
fixture such as an
ERS that requires a
point source.
... I would assume that a modern lamp coupled with the newer designed
reflector, properly benched, with clean optics, could outshoot a FEL.
The thing about an FEL is that while it is 1K in wattage it is, as
halogen technology goes, an old, inefficient design. Wattage alone is not always an indicator of better output. The FEL has a big honking
filament, such a large
filament is hard to optimize is the
focal point of a
reflector. Thus a lower wattage lamp with a better designed
filament can equal a better final output. ...
All true statements, but I suspect the FEL, inefficient as it is, will still win as the brightest available lamp (short of this alleged, illusive GLV). From
http://www.controlbooth.com/forums/lighting-electrics/20325-lamping-question-varied-inventory.html :
I have a number of the same Colortrans (5/50 and 213s) and the
Strand fixtures that you refer to in my inventory. I typically use the GLC lamp in them. I did a
blind side by side test on four identical fixtures using four different lamps including the FEL and GLC and much to my surprise the
fixture fitted with the FEL was picked by the judges as the
fixture with the most "punch' - the GLC was a close second. ...
Now it's possible that, in
fixture with a
reflector designed for it, the GLD can be brighter than an FEL. This would be a
reflector designed in the last ten years, and I think includes the "super
reflector" for the
Altman 360Q,
part# 97-0125.
... They also say a 750 FLK is best. ...
Well then, "they" are misinformed at best. There is no such thing as a "750 FLK". The FLK, per its
ANSI code, is a 575
watt only lamp. Therefore, I'd be suspicious of ALL information on that particular site.
...(FLV, FEL, FLK...what's the difference?)
The FEL family (includes EHG, EHD,
etc.) was developed in the mid 1970s. The FLK/HX600 (late '80s) was the second generation, with slightly improved
filament geometry, but suffers premature failure due to fragility. The GLA, GLD, GLx family (late '90s/early 2000s) is the third and
current generation, "borrowing" its
filament geometry from the
HPL Source Four lamp (four
filament segments; Note: "
HPL" is NOT an
ANSI code).
The ultimate performance goal of any
incandescent stage lamp is to get the
most tungsten material mass in the
least amount of space, approaching the "theoretical
point source" for optimum efficiency.
FEL on the left, GLC on the right: