Quote Originally Posted by SOG
Zandor, I am new to the site and have a couple questions you may be able to answer. I have 12 plants in a Deep Water Culture system. They have been in the system for two weeks now and are looking good. I am curious why the pH climbs daily. The first week it appeared that they wanted the water more than the nutes as the PPM was very steady. This week the PPM is dropping gradualy which I assume means they are feeding. I plan to change the solution today and set the PPM at around 1100. I took some pics at one week if you want/need to see them.

My second question is this: I use a 1000 watt HPS on a 6 foot motorized track. If I wanted to expand my next grow do you feel this is enough light given the distance it travels? In other words, since it would be six feet away from the plants for a minute or so on each travel down the rail is this a problem for the plants or does it not matter? I am currently using about 2/3 of the travel with the pause at each end set at 30 seconds.

Any help would be greatly appreciated.
Light movers are fine and I know of many people who use 10' rails. I prefer the 6' rails when I have grows that can use them. Do the math for the foot print of your light. 1000w HPS lights have a foot print about 4' or so it's just the ends that don't have full time light but that's ok you still get good coverage. Just watch the temperature at the top of the canopy and you will be fine.