Looking for Cheap enhanced HPS Bulbs

[OrganicOzarks]

I am going to start changing bulbs every run, and I am in search of cheap enhanced spectrum HPS bulbs. I run all 600 watt lumateks. I have found some stuff around $37, but would like to see if there is anything out there a little cheaper.

 

[Vernal Equinox]

I think to get actual 600 watts, you need to use the bulbs specified by the actual Lumatek ballast. This is not from experience, mind you, but I came across a couple of threads stating that digital ballasts have certain bulbs dialed in.

GL