Hi Esk
L Bhac is run by Pitlochry Angling club and is in the middle of Tummel Forest, it is stocked regularly with decent sized rainbows, thogh not in the supersize class. There is a bit of a walk down to the loch from where you park your car so probably wise not to take too much tackle. (I have taken an electric outboard down before but it was a killer carrying the battery back to the car).
I personally haven't fished it this year but have heard it was fishing well. All the usual rainbow tactics work and so do traditionals. The fish are usually fairly obliging unless you get bad conditions. There is a bag limit but can't remember what it is. The setting is beautiful and the views across to Ben a Glo stunning so all in all its a nice place to fish. Hope you have a great day and enjoy it.
all the best
Gordon