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Red vs. blue and growth control

My "Crystal" val grows to lengths of up to 42 inches.  It's supposed to get 
to more like 24 inches.  I suspected for a while that it might be jungle val, 
but the leaves aren't as wide as jungle val.  I am using a Phillips Advantage 
50 and a GE "kitchen and bath".  The GE is extremely red to the eye.

Is it possible that I might get shorter plants by replacing the K&B with a 
7500K bulb?

Bob Dixon