Just from my own experience and doing a lot of reading, it's not that they wouldn't grow, they'll veg fine under a single 150W, as long as you don't let them get too big - the reason I say this is that the larger the plant (width, height), the more light you need to cover not only the top of canopy, but now you have to get light to the sides/bottom of the canopy as well, and you need enough red/far red light to get there in flowering. The smaller the panel, the fewer diodes, the smaller the foot print/spread and power to get the light they need during flowering to the buds. So it's not that they wouldn't flower but your might be disappointed in your yield imo. Yield and quality buds is complex balance of giving the plants everything they need (air, water, nutes, light) so if you skimp on any of them, don't expect to grow some of the big/dank bud you see some people posting here. There's no right or wrong way, you have to try things and hopefully learn as you go. You could try one plant under 1x 150W LED, or try two, keep them smaller, supplement them with your existing CFL's (or better yet, swap the CFL's for LED bulbs), lot's of ways to skin a cat as the old saying goes, but give the plants the light they need or suffer with smaller or disappointing quality yields.
I personally haven't done any aero/hydro grows with LED's but there are many people doing it right here in the LED forum. That's one of my 2014 side projects, among many - lol