Just looking at some spectrum charts for grow lights... They certainly vary, but not in any uniform fashion. There is an exception to this: there is a standard

Just looking at some spectrum charts for grow lights... They certainly vary, but not in any uniform fashion. There is an exception to this: there is a standard LED graph which shows up quite frequently, identified by it's peeks in the deep reds, yellow, and dark blue, with a marked trough at cyan.