I don't know. I do know that they were more efficient than anything else for Lumens per Watt Input. Their color rendition is aweful. Whether the plants like the color or not is the question (pink-yellow). Besides, it's getting to be an obsolete product, so that's not good....

Shovelhandle
Shovelhandle Reviewed by Shovelhandle on . anyone tried LPS? Has anyone tried low pressure sodiums. From what I'e read, the're more efficient than HPS and have a longer life, ballasts aren't cheap though. The light is 1800k. You think that's too low in the spectrum? My flower room is about 2.5'x5' right now, I'm using a 400w hps with 350w of mercury vapor and a shit load of 26w 2700k cfls on the sides. I was gonna put up 2 400MH lights with 3000k bulbs thinking of adding a LPS as well. The 3500k MV lights increased trichrome production. Think that Rating: 5