*help* Thinking of putting one led spotlight in my room....

I'm currently in veg stage with my plant about 3 feet tall. I have 4 daylight spectrum cfls on it but was thinking of adding one 10 watt LED flower spotlight. My thinking is to get her ready for flowering which I will induce in about 2-3 weeks. Would anyone advise against this? And why?

Nope wouldn't advise against it at all. Your plants will use both spectrums in veg and also in flower.

Some blue during flower increases trich production.

Not sure whether you "need" red spectrum during veg in regards to prepping your lady for flower it certainly won't hurt her though, people generally "prep for flower" by lowering the photoperiod each day coming up to switch, this could be done even with all blue spectrum lights.