Autoflower: 6500k or 2700k?

For autoflowering strains, do I need to switch from my current 6500k 42W CFLs to a lower temp like 2700k? If so, when?

Right now, the plant has 2 of the 6500k 42W CFLs, and it's at day 17.

your good to go once u see bud sites forming and it starts to really strech out then u can go to 2700k ...............autos seem to like mix lght spec the most

i used a few of the clip on 150 watt work lights with some 120w philps growligh floods to cover the areas the cfl was missing as the height got taller

best trick i learned was to grab some old paincans with unused paint clean up the can then take a peice of pin fur strip (98 cents for 8 feet) cut a about 4 5 foot peice then duct tape it to the can so u have a weighted stand to clip the light too

just rem u need a good foot of room so the heat does not effect plant ...........take your hand put it on the closes part of the plant to the light and let the light hit the back of the hand if it is to warm after 30 secs move the light back more (this is light burn on a plant and how to tell if u are)

I agree that you need to change to grow spectrum only when the first buds appear but autoflowers does seem to like the red spectrum more and that may be from those ruderalis genes.