* Use on ANSI M81 or any other ballast capable of running HQI bulbs.
* Will work on Hellolights 150/175W Electronic ballast.
* Approx bulb dimensions: 5 3/8" L x 1"W x 1 1/8" H. Length measurement is end to end.
* A high quality, German made bulb.
* When mounting a double ended bulb, make sure not to touch the outer glass with your bare hands. All fingerprints should be wiped off with a clean cloth soaked with alcohol.
* Excellent blue color