Using just RED LED for final wks of flower?

Hey there Sticky Fingaz, just ask yourself this : "what color is the sun?" that's the best color for plants , i think the best bulb for that spectrum is Tungsten Metal Halide something like off white is what you should be going for. There's a reason all the LED companies' new lights are white with just a few red diodes. So to answer your question specifically : it wont do much , probably wont help at all , nothing you can really do towards the end of flower that really does a lot, your best bet is probably the opposite : reducing your light cycle the last week or 10 days , THC gets degraded by light, that's why folks try the dark period before the chop, but reducing your light cycle works better. Hope this helps 🚀