"As you can see they reached "your version" of the perfect light on the second generation. Why produce 3 more versions? if they got it right on the second try?"

It's called marketing. Look at the men's razor marketing, and you will understand, most people making LED panels are following the exact same methodology. In reality, they have NO CLUE which wavelengths are the most efficient so they're just throwing out random mixes. I've seen 11-band panels, and I laugh. Quad-band with trace is all you need for terrestrial plants, and you need hex-band for aquatic plants.

"Customers demand more colors so they put them there to sell lights?"

No, the customers generally don't have a clue so they're led to believe "more is better" when the purpose of LED lighting is to target only what's needed for the most efficient growth and production.

Few makers of panels will EVER be straightforward with the customer, it's all about making the sale to them.
khyberkitsune Reviewed by khyberkitsune on . Importance of 460nm red LEDs? Here is something very confusing to me. Many LED proponents loudly proclaim the need for 460-470nm red LEDs over the cheaper 630nm LEDs. I understand that this better coincides with the accepted chlorophyll B absorption peak. So far so good. LEDs veg very well given appropriate wattage & color. So far so good. LEDs do not compare (generally) to HPS flowering as far as yield. (Please - let's not go off in that direction here. Thank you!) Rating: 5