There have been a few posts regarding ballasts lately. It may partially due to "matched" parts - CoralVue 250w e-Ballasts & CoralVue Reeflux 10K 250w ... but, I converted all 6 of my MHs today to this combination and I am AMAZED! Brighter and more brilliant white than ever before. Outperforming any 400w bulb on mag-ballasts by a good margin.

And great service from Mark at CB Pets - thanks man!!!