a few lighting questions

Ok so i have two different lamps that im going to be using for light, but they arnt what i need help with. One question is that when i have my first light which stays 15 inches away from my plant, would it be cool if i turned on my tall lamps for a little more light support, second question, my tall lamp has a dim green bulb on it, at night, would it be ok to turn on this light at light and point it away from it, would it make a big difference, would it be good or bad