First, welcome to the forum!
The trigger just pushes the sear, it does not affect trigger pull weight unless it ill fitted and dragging on the frame. Some people also think a flat trigger feels a little lighter but it still does not affect the true weight.
2lbs is about the minimum you will see on a 1911, any less and you will risk hammer follow and going uncontrolled full auto (Not a good or safe thing) and getting one that low takes top end parts and a very good gunsmith. For carry most want the trigger in the 3.5lb-5lb range. A good gunsmith can get that with the parts in your PT1911. For do it yourself I would recommend a Wolff spring set to do it on the cheap Springs for COLT 1911 GOV'T PISTOL Semi-Auto Pistols, you will want a reduced power hammer spring and a sear spring. Stock is 23lbs and for reliable ignition I would not go under 18lbs but the spring set will not help trigger creep or take up.
If you are willing to spend some $$ you can get a full hammer set, which will replace most internals and are sold by what weight you want. I have had great luck with Cylinder and Slide, 1911 Hammer Sets, Note they do not include the trigger. I have a Ultra Light Speed II 3lb kit in my PT1911, it was almost completely drop in, very crisp and is just under 3lbs. Only hand fitting was to replace the thumb safety, which is pretty standard when you replace the sear, as that is what the safety fits against.
Most will agree that having your trigger very crisp (no take up, creep or over travel) is more important than it being real light.