I don't think you got what VillageIdiot ( ) was telling, since it wasn't quite clear: The two lasers both promise 30mW of power. Now the one that has IR filter does not emit any (or at least very little) IR energy, so in order to still be outputting 30mW it must theoretically output 30mW of purely green light where the other one emits 30mW of both IR and green.If anything an IR filter reduces the amount of green light you get. It is another piece of glass that the beam needs to pass through.
Now that's what only a mathematician and me would be pointing out, but I just had to say it.
And may I ask, since I'm new to this stuff but so excited, why do you think that a laser will have less power in a cold night? Shouldn't heat be a problem, and therefore cold conditions desirable?