I don't think I can help much but I noticed the same thing on my plants this evening. They are in day 7 of flower and I got the same scorched tips and a few beige/light brown spots towards the center of a few leaves. I'm growing under several 42 watt cfls. It was almost time to water so I went ahead and flushed with water and backed the lights up from 2" to 4.5" from the tops in case it was nute burn or too hot from the lights. Hope everything works out with your ladies. btw, nice looking plants. I'm a complete nube at indoor growing and have made every mistake in the book, and knowing my luck I took the wrong actions with mine...
Keep us posted please!