Until 1992, Strand, Colortran, and Kliegl/CCT made ERSs optically superior to Altman. But the rental houses stocked the 360Q, partially because of price, but also due to durability and familiarity.
Today, the SourceFour™ enjoys that distinction, having sold over 2,000,000+ units. No other manufacturer even comes close.
The Altman Shakespeare, Strand SL, Leviton Leo, and Lightronics may be acceptable, but in my opinion, do not compare to the SourceFour™. I haven't used Selecons enough to make an informed judgment, but have heard some negatives.
The Lightronics version says "glass reflector," not "dichroic reflector," and although the performance numbers are slightly higher than S4 for the 10° and 19°, the others are somewhat lower. Anyone can "peak" an ERS and make the numbers lie.
Also, I've found since the 1970s that the more information a manufacturer provides about the performance, the better. Things like candela, mf, beam angle, field angle, etc.
Today, the SourceFour™ enjoys that distinction, having sold over 2,000,000+ units. No other manufacturer even comes close.
The Altman Shakespeare, Strand SL, Leviton Leo, and Lightronics may be acceptable, but in my opinion, do not compare to the SourceFour™. I haven't used Selecons enough to make an informed judgment, but have heard some negatives.
The Lightronics version says "glass reflector," not "dichroic reflector," and although the performance numbers are slightly higher than S4 for the 10° and 19°, the others are somewhat lower. Anyone can "peak" an ERS and make the numbers lie.
Also, I've found since the 1970s that the more information a manufacturer provides about the performance, the better. Things like candela, mf, beam angle, field angle, etc.