I would like to answer this portion of your question with D) All of the above.Is the advancement of cob usage due to it's superior photosynthetic absorption, or just that they are 10 times easier to mount and wire in a high wattage package?
There's a few chips that are full spectrum. But of your shopping by nm then 440 465 470 blue, 660ish red. Its not too crucial. Iv been looking for a uvb chip to add with no luck.What is the right spectrum and who said anything about lumens? If there's some truth to a balanced full spectrum light source being better than red/blue it's going to come in the form of empirical data, not opinions. It's clear that blurple hasn't captured the market but I'm questioning why that is rather than assuming cobs are better because they're popular at the moment. Total cob efficiency depends on the emission of blue light. This is apparent when we start seeing the notable drop in efficiency at 2700K so it's not clear that red shifted blue light is more efficient than producing it through the band gap.
No, white is a distribution of all visible nm from 400-700nm. If white light is really white, its called cool white and have more blue. If it is more yellow it called warm white and have more red.Its not just a mix of blue and violet LEDs?
It'll most likely grow a plant. Same as any other cheap Chinese light. There are lots of pictures of people using cheap blurple panels on other forums, they just got shunned here.What kind of results would 750 PPFD blurple provide?
Are the lack of examples due to a lack of high efficiency blurple lamps, or just that blurple is no good? Is the advancement of cob usage due to it's superior photosynthetic absorption, or just that they are 10 times easier to mount and wire in a high wattage package?
There is no 'right' spectrum, different balances produce slightly different photomorphogenic response. Right now those responses are still getting worked out by hobbyists and botanists alike.What is the right spectrum and who said anything about lumens? If there's some truth to a balanced full spectrum light source being better than red/blue it's going to come in the form of empirical data, not opinions. It's clear that blurple hasn't captured the market but I'm questioning why that is rather than assuming cobs are better because they're popular at the moment. Total cob efficiency depends on the emission of blue light. This is apparent when we start seeing the notable drop in efficiency at 2700K so it's not clear that red shifted blue light is more efficient than producing it through the band gap.