Unfortunately you probably wont see much of a PAR increase from them, they are only 1w LEDs. They will make a great companion light to your set up like a moon light. I have an Icecap one that really lights the tank up, but really no par cant even tell it on with the T5s on. I use mine to watch all the corals glow at night in the "moon light". No heat though.
Otherwise what your saying is, any led under 3w would pretty much be just for show? I'm asking cause I was thinking of adding a strip light myself.