Those 14w panels are almost useless - too little light. There are similar ones in the 45-55w range which work quite well, but are notorious for burning out the poorly designed power supplies. Stay away unless you can get a rock solid warantee.

I am having good luck with one of the 3 fan, 3 color 120W units. I pulled just under 3 oz from one plant with one.

Prices are pretty good right now. $700 a few years ago and now under $200.

If you need something smaller, some of the 90w UFOs are decent. Again, only get one with a warantee.