LED red and blue spectrum / cfl concept?

[CAPT38]

My question is this....if plants only absorb certain spectrums of light such as red and blue (blue for growth and red for bloom) why don't we just use these colors like with LEDs ?
My real question is if red and blue leds grow plants as well as what I have been reading, then why wouldn't red and blue cfls work.
A top of the line led light is in the ball park of. $2500
13 watt. Colored. cfl is $5
From what I have been reading leds have less lumens than cfls, and the reason that they work so well is by targeting the red and blue spectrum of light in theory a red and blue CFL should work as well or better than leds right?

Just curious.