Lighting "experts" please respond, the kelvin issue

[HereticHammer]

I am getting a new T5 lighting fixture and had a choice of either all 3000k lamps, all 6700k lamps or a mix of the two. I went with a mix of the two but I really want to hear strong arguments from all sides of this issue so I can be better informed when I replace the bulbs in a year.

This thread is for all those who have some knowledge on kelvin temps and plant growth and flowering to share that knowledge with us, pro and con, so we can make up our own mind.

I have heard MANY say that they are growing AND blooming plants just great under all higher kelvin (6400k, 6500k, 6700k) bulbs. I hear just as many that swear by mixed lamps (3000k and 6700k.)

I also know that there are those that say that you need a mix of bulbs because the lower kelvin is for blooming and the higher for growth but if orchid growers can grow AND bloom plants under higher kelvin lamps, why do we need the lower ones?

Is there any solid science to all this?

Ok, lets here it.