Tonight we got a surprise we didn't expect. We tried a brand new out of the box Colortran mini zoom side by side with a S4 (750W fixture) fixed degree. we bench focused both fixtures, mounted them on the same stand using a T bar pointed at a white painted wall in a brightly lit workshop and fed simultaneously from one power cord with a twofer attached to the fixture pigtails. The S4 was fitted with a HPL 575 lamp and the Colortran with the FMR lamp below: Wattage 600 Lumens 12500 Base GY9.5 Shape T5 Overall Length (mm) 88 Life Hours 2000 Kelvin 3000 CRI 100 Color CLEAR Filament CC-8 The zoom was adjusted to give the same diameter light pool as the fixed focus S4 - the surprise both pools of light were: even, sharp edged and equally bright. We double checked the S4 no change. Even more puzzling was the reflector in the zoom was nothing fancy. We have not seen this lamp before and haven't seen it discussed but has anyone else used it? The specification doesn't suggest it should be anything overly special and the extra 25W over the HPL doesn't account for performance. The S4 is less than 6 months old and has spent almost all its life in a road case, is clean and in new condition. We tried another S4 and got similar results. we measured the supply voltage and got 121V at the twofer. Maybe we got lucky with Colortran and the lamp, maybe some of these lamps and fixtures are better than we realise. Certainly ship has claimed that a number of newer fixture types are capable of excellant performance with the newer lamps. This comparison while not definitive was done with the intent of seeing how much better the S4 was in comparison to the colortran - we surprised ourselves here. We only use GLC and GLA in Strand, colortran 5/50 and CCT fixtures and properly bench focussed and in the case of the 5/50s with minor optic mods that anyone can do they perform well. Again we have tried FELs side by side with the GLCs in all these fixtures and the GLCs produce more and better light on the stage. This was just our experince tonight has anyone else tried this?