Again, the misinformation on this thread is quite alarming. Fluorine (elemental) does not exist in nature on its own. Full stop.
I don't think my point has sunk in just yet. The Rock Phosphate fertilizers and some of the nutrition supplements being used in the grow industry have been shown...
And this toxic chemical you refer to is ? fluorosilicic acid? A little research and knowledge of chemistry and you'd find out quickly, I might add that fluorosilicic acid reacts instantly with water to produce HF and silica, The HF being so reactive that it reacts with any mineralization...
You can't chemically separate out Fluorine from CaF2 seeing as it is so incredibly reactive.. Calcium Fluoride occurs as Fluorite naturally in many kinds of rocks, so I really wouldn't worry about it. I really don't understand the paranoia around Fluorine... For one you can't separate it out...
After having the little incident with CKS over chat and then finding out that their chat is being farmed out to a PRC frim chat app service makes me really not want to touch any of their product. Also, there are reports that their chat has been responsible for credit card fraud and ID theft...
I tried asking a simple question the other day and got a run around from CKS. I asked about how they could guarantee the genetics of the seeds. What testing method did they employ to ensure seed viability, and what method did they use to sample the genetics of each batch? Long story short...
True we don't know how many total lumens we're dealing with, but one thing is clear, the quality of the light determines how effective the light output will be for the plants. 4100K is not ideal in terms of PAR.
Color temperature is quite significant. Many phosphor coatings especially those used in the 6400-6500K (daylight) are heavier in the blue end of the spectrum. This helps with leaf growth. (PAR measurements are far more important than watts). This is akin to the old quality vs quantity conundrum...