Lower your R:FR ratio and it will stretch more.
I have tried to get what you mean by reading this
https://gpnmag.com/article/r-fr-ratio/ but it is all confusing. Can you collaborate more on this topic.
My all lights come with VEG and Bloom switches and the 1200W one also dimmable. Before I used to have both switches ON and 1200W one had been set to full power. When I posted here after reading this topic I decided to switch Bloom on all lights OFF and dimmed VEG on the1200W one to half of its power. Today is the third day they are sitting in my cabinet under this condition but I still cannot see any significant grow or stretching. According to the plant I measure it may be grew 1-2cm top over these three days.
I also moved stretched plant from outside to the same cabinet. It is receiving the least light among them all. I topped it before moving and I was not expecting to monitor its growth rate but I can see that the topped part is developing two new nodes is quite noticeable.
In regards to R:FR ratio, are you suggesting that I need to have both BLOOM and VEG switches ON or having only VEG switch ON and BLOOM OFF will help with stretching?
The lights I have is VIPARSPECTRA, two 600W ones are their V model and the 1200W is their PAR series. My first grow was with just three of their 600W V series but I started using them in the third week of their vegetation state. At the beginning I had really crappy chinese LED that claimed to be 1000W but in fact based by power consumption barely reached 300W.
So in the first grow seedling were stretching a lot for the light under these chinese LED. By the time I switched to VIPARSPECTRA seedlings were quite tall.