The high performance USHIO HPL+ lamp has been redesigned to be the most powerful HPL ever. It's ultra-compact filament geometry improves the optical efficiency of your ETC Source Four fixtures to produce up to 20% more fixture lumens compared to the old lamp design. Competing HPL lamp products are limited to larger filament dimensions than the USHIO HPL geometry. Working in close cooperation with ETC's engineers, USHIO has matched the "innovation" of the Source Four fixture by making a more compact (6.0mm x 9.5mm) filament profile. This improvement partnered with the optics of the Source Four, generate ultimate axial and radial light distribution and optical system efficiency. The Source Four's precise optics demand precisely engineered lamps. USHIO has responded to the Source Four's need for a reduced geometry filament, and has done so with quality manufacturing standards. Performance you can measure, quality you can count on, variety of lamp types, and innovative design for your theatrical needs.