i have sum advise for you... i was using the same set-up as you are.. i still am, but my advice to you my friend is mix up the bulbs. for example, if ur using 6 - 6500K spiral bulbs, remove 2 of them so you can replace them with 2 - 2700K spiral cfl's.. it will make a world of difference! trust me! i was running 7 - 6500K which were doing the job but once i replace 3 of the 6500K's with 3 of the 2700K's i was truely amazed! the leaves got alot fatter and the plants began to grow at a much more quicker pace! good luck & i hope my advice was helpful for you!
more than likely your leaves got wider and the plant grew faster because it wanted more light...
If your plant has enough light it should grow nice and compact(not searching for light) Wider leaves does not mean a better plant lol...mostly has to do with strain, but plants adapt to survive, the plant wants more light to convert to energy so it makes the leaves larger(the leaves are like solar panels) so that it can get the light it needs.
lol, I use 6 6500k for veg...16 2700k for flower...There is already blue light in the 2700k just as there is red light in the 6500k... Did you know that blue, red and green light make white? 6500k is a mixture of all threes spectrums, just as 2700k is... more blue light provided in the 400 to 700 nanometer wavelengths(appx 7000k I believe) is closest to the natural color of the sun for vegetative growth period....More red light provided in the 400 to 700 nanometer wavelengths(appx 2300k I believe)is closer to the natural color of the sun as fall is approaching...
I agree many people use a mixture, but like you said don't be cheap...buy as many bulbs in the color spectrum that is right for each stage...
Why do you think people switch from MH(veg) to HPS(flower)? The color change...(the lumen output may be a little higher, but not worth the switch on its own)...
anyway, it would be nice if people would research the effects of the different color lights on plants before they give out bad info...
If you don't have the money to get enough bulbs to have the best lighting for each stage, then yes a mixture would be best...
and my advice to you is get some more light lol 7 x6500k 1750 lumens is just over 13,000 lumens...taking 3 of those away and adding the 2700k should have dropped you another 150 lumens appx...