All I use are pro-grows. They come from the same factory as pro-source. Either would be a realiable choice. If you look at the pro grow line and want something more tuned to flowering check the 260 or 550. I have two 180s, a 250 (2010 model before it became the 260 in 2011), and a new 550 which is a beast. The 260 and 550 have a much larger concentration of flowering diodes, about a 1:3 ratio in favor of flowering. The 180s have a 1:1 veg/flower diode ratio. Hope this helps. I have a completed journal in my sig. I will never go back to HID.