The H380 is on/off, no intensity. There is a spectrum choice, grow & bloom. Like crabs, I've been drinking the Kessil Kool-aid for quite some time, so I'm familiar with how these lights work. My 22g had three 160's over it at the end (along with a 4 bulb ATI sunpower) and my current 90g shallow has two ap700's. I just mounted an a80 tuna sun over my 5g planted freshwater tank, so you could say I like these lights, a lot. ;Woot Cheers!