Not a huge fan of any conversion bulb, as the cost of use after a single replacement would generally cover the ballast that you're not buying.

I'm not familiar w/ this bulb in vivo, so I can't be more specific. (What's up with the spike @520-530 nm? Lot of power at not-so-great wavelengths...)
rhizome Reviewed by rhizome on . Ceramic Metal Halide Bulbs...for HPS ballasts? Phlips MasterColor Ceramic Metal Halide ~ CMH ~ HPS-Retro White OK..techies...what does everyone think about this bulb? Rating: 5