Use the chart in the FAQ follow it's directions.

If you are using only HPS and not an enhanced HPS bulb the plants are missing the blue color spectrum and the growth will be a little yellowish looking in color. They are not producing all the chlorophyll they should.

How far along are they now, I forgot?
Zandor Reviewed by Zandor on . Finally getting PPM meter today!!!Questions?? Finally getting a PPM meter today! I got a decent pH meter last week and plants seem to be doing alot better since I got it and am able to keep my pH down to 5.8. Now they will be that much happier. I am using GH three part and need meter now that I am into second week of grow..Plants seem to look a little on the light side tho...The leaves aren't curling up or down this time tho..just wondering if I am lacking something? Maybee it is the 1000 watt hps light? Does someone here know what it Rating: 5