I used High Power LED Grow 4s Lights that produced ligh spectrum similar to sun for indoor farming. Grow lights are also called farming LED.
High Power 4S is becoming the global leader for providing lights for Alta LED technology which is best for Growing Plants with best results. Each and every single watt diode produces the full spectrum fulfill their desired intensity.
I suggest you to try for one time and you know its qualities for indoor planting.
Sounds like you're in the lighting business Jan.....
Given the diversity in the claimed producers (bulbs/tubes/emitters) of "full spectrum light" and lacking any type of standard for determining the efficacy of man-made FSL, how do cold-light LEDs factor into vitamin D3 production in birds?
In the past few years we've seen the lighting market jump on the LED bandwagon, but I have not seen any independent studies as to the efficacy of using these products in the production of vitamin D3 in humans or animals.....granted, there has been a lot of supposition about their use in "light therapy," though the verifiable independent studies continue to be lacking there also.....but then, that's why manufacturers maintain good marketing departments, isn't it, to spin the truths?
In your post, you mentioned that you "used Grow 4s Lights," what do you use now?