You should have no problems whatsoever carrying on regs- there is nothing about that them that makes them "check only" items.
I fly - A LOT-. Approx. every 6 weeks or so, often carrying photo/video equipment and SCUBA gear, including canister lights. I've found it best to get to the airport early so you aren't rushed, and to be up front when you go through the securoty checkpoint- open the cases and tell the gate agents what the stuff is. If you are carrying canister lights, it's a good idea to rubbedr band the manufaturer's manual around it. This really smoothes the way and makes things easier on you AND the agent. "Screwing" with the agents for the fun of it just isn't worth the hassle in my book.
I fly - A LOT-. Approx. every 6 weeks or so, often carrying photo/video equipment and SCUBA gear, including canister lights. I've found it best to get to the airport early so you aren't rushed, and to be up front when you go through the securoty checkpoint- open the cases and tell the gate agents what the stuff is. If you are carrying canister lights, it's a good idea to rubbedr band the manufaturer's manual around it. This really smoothes the way and makes things easier on you AND the agent. "Screwing" with the agents for the fun of it just isn't worth the hassle in my book.