What's your HID go to bulbs and how long do they last?

[MatStrat]

I used to run 2 630 cmh bulbs from iluminar on my 4x8 space. I found that, for HIDs, CMH’s worked best for me. I replaced them every 4 grows… so about more than a year of constant use and I didn’t change them because they stopped working, just because I find they VERY SLIGHTLY lost intensity