I temporary installed a 14K Coral Vue 250w next to a 12K Reeflux 175w lamp on my 155 and the color was a perfect match. As a matter of fact when I asked fellow workers which was brighter they all picked the 175w, altought my meter said the 250 was brighter. Just a little thing but, Reeflux are made for Electronic ballast but will work with Mag. Ballast.