The diodes changed a little in the past few years. Still very similar, but one is more efficient. Lm561c was v1 and lm301b is v2.
The number is only related to the number of diodes on each board.
You can't compare a qb288 to 2 qb132's, or can u? Fuck all I know is they dont need to know why. They just need to see one in the shop and be blinded by that light.
You are righr. The 3000k is yellower. The 4000k is more whiter. The 5000k would be almost a bluish white and 6500k would be damn near blue. Going the other way I dono. 2700k is pretty yellow too. They 3000k is THE shit for flower! After I hook up my reds I will help u along.
This is omly rhe beginning of your journey my friend. STAY HOME AND PLAY WITH YOUR LIGHTS , YOUR SELF. JUST DONT GET THE SHIT!