Just wanted to say that I got to love them leds. I been using them for 3 years now and I am starting to get them down. Use of Cal/mag is a must. Sometimes double the recommended dose is required. Other than that, leds have been working for me and I already have a 3 year jump in my learning curve to dial in my meds. Enjoy the pics of my next launch of ladies. PL. P.S. This is a 4 by 4 pan under the Mag Plus2. Height of girls vary from 2-3 1/2'. I have vegged some up to 4' prior to this. Great deal for me. At over 40 cents a kw where I live, this sure as heck helps.