In a 250w SE, I have 10k Ushio bulbs. Not pretty, but good growth bulbs. These probably have about 8-10months of use. I have a 12k reeflux in use now for about 8 months.
I have a new Coralvue and a reeflux bulb. I'll be upgrading to LED on my frag tank, so I probably wont need both of these.