Going to flower 4 Double Tap which is a cross of GG4 and Black Banana from Solfire gardens. Plants are in 2 gallon smart pots filled with coco and watered with top feed drip and I will be recirculating nutrients in this grow.Lighting is a 600w HPS and a HLG 550 dimmed to 300w.
It should be an interesting side by side. The HLG 550 puts out a lot more light and to keep this comparison fair I may need to dim it down to 250w. I want to see how the same strain performs under 2 different lights and spectrums.
I have had a problem with foxtailing on some strains and the Double Tap is one of them. So I am hoping to find out if spectrum has anything to do with it. Honestly I dont really know if it does. Too much light of any spectrum might be the cause so I will be running a 13 off and 11 on light cycle to see if that makes a difference. I also will try to keep PAR readings under under 800 micromoles.
Other things that can cause foxtailing are to much nitrogen or high temperature. I dont think either is the cause in my case. Temps never get too hot in fact with LED grows I usually need to add heat except during the summer. I run bloom nutes which are low in N too but I will run around 600 ppm to try and eliminate that as the cause.
Some strains foxtail naturally. Many sativas and hybrids with those genetics do and GG4 one of the parents of Double Tap does as well.
HPS Vs LED Side By Side Day 7
On day 7 all 4 plants are doing great. Growth has been good under both lights. I have a fairly even par of 450-500 on both sides of the closet. It does seem to me the HPS plants are showing more vigor with more lower branching than on the HLG side.
Double Tap Day 14
Plants are starting to flower on day 14 and look good. Both sides of this grow look about equal and I have adjusted the lights so par levels across both sides are in the 500-700 micromole range.