Question about Vegging under T5 lighting...all help from experienced folk appreciated

hello...i had been battling heat from my metal halides ...so i bought t5 lighting (2 QTY - 4Ft x 2 FT 8 tube units....

they came with all 6500k lighting....i was going to buy some 2900k ( or whatever the low one is) ...and mix them up,..so i would have the warm and cool bulb..mixed spectrum.....but the guy at the store said i didnt need it...

what do yall think....i am willing to spend the money if it is better for having it...

again...i appreciate the advice of you experienced folks!!!

The 6500 are perfect for veg..

Yes if your just going to veg under the t5 you do not need anything but the 6500