m0useanswered grow question 3 years ago I can not say I have used them. I understand the logic behind them and think its interesting and I like it.
If they are needed is another question.
As a basic tool for a hobby grower, probably not needed.
As a more professional tool for really narrowing down your environment and settings for massive yields. Quite useful
Its the cost vs benefit analysis that's hard to set it apart as good or bad. But if money is no open, then YES.
If you find it helps you. A+ keep on going.
If you find it does not. PM me and you can ship them to me and I'll test them out ;)
Your plants look nice btw. Keep up w/e it is you do.
Happy Growing!