This 4-pin GE 42w Ecolux® Biax® T4 lamp offers good color rendering and long life. It suitable for use with rapid start electronic and dimming ballasts. The lamp features GE Ecolux® Biax® T4 technology, able to be dimmed with a compatible dimming ballast. It include end of life (EOL) protection technology, and is TCLP compliant. The lamp has a 3,500 degree Kelvin color temperature.