There are several alternatives to the lamps you are using currently, first of all what kind of
fixture are we talking about, is it an
Altman 360Q, or is it
strand or is it a
colortran 5/50. All of these fixtures now take the newer generation lamps such as (in some what of a chronological order) FLK, GLA, GLC, GLD, GLE, HPR, and SPH.
The FLK was an early attempt at making a more efficient lamp opposed to the 750W EHG or 1000W FEL, it is now not as efficient as some of the newer lamps.
The next set of lamps are the GLC, GLA (575W lamps) and the GLD/GLE/(GKV?) which are 750watt lamps. Those 5 lamp types have a
filament similar to the one found in the
HPL lamp of a
source four and are much more efficient than the standard EHG or FEL lamps that you have mentioned.
Another attempt at making older technology more efficient was the HPR, which is a 575w lamp with an internal
reflector to complete the
reflector curve of the
fixture when seated in and used. It shares a similar
filament to that of the EHG, but is much more efficient.
Last but not least, USHIO just recently released a new alternative to the GLC/FEL lamp, it is calle the SPH 575/115. This lamp is also a 575w lamp and it is even more efficient than the GLC and its relatives.
However, I am not totally sure on this topic and it is best to wait for Ship to come and explain this in more detail. The most important note I will leave with you is that if the
fixture has older style optics or the
yoke label says to use only lamps like the EHG and FEL, then more than half of the lamps listed above cannot be used in your fixtures because they will cause the
reflector to
bubble/burn over time from melting. You may want to try the Thorn HX600.