I use a number of rods in this size depending upon the type of river/water I fish. If I fish my local stream which is heavily overgrown and max 4m wide I use either an
ECHO CARBON 7'3 #2 weight or an
ECHO CARBON 6'6" #3 weight. I load the #2 weight with an Airflo Ridge WF#2 and the #3 weight with a RIO Gold WF#3F. With both of these rods I regularly cast distances of up to 10m max 12m (I don't have to cast any further).
However when the Garfish are in I use the
ECHO CARBON 6'6" #3 or an
ECHO2 7'8" #3 to fish for them on the coast

. For this type of fishing I occasionally use a RIO-Gold WF#3 but I normally load the rods with a home-cut 8.5-9g shooting head.


With this set up and not casting into the wind ( I dont use the #3 weights on the coast if its windy!) it is easy to reach distances of about 18m-20m.
IMHO you dont have any distance casting restrictions (within reason) with #2 or #3 weight rods. However you should be aware that they are not designed for casting large weighted or even large non-weighted flies. I fish dry mayflies up to about size 12 and at a puuuuuuuush a size 10 with the #3 weight. On the #2 weight, which is is my "goto" rod during the summer months, I use size 14 or smaller cdc&elk sedges and size 14 or smaller beetles, ants or other terrestrials. When after Garfish I use small crazy charlie type flies, tied on a size 12 or 14 hook weighted with small bead-chain eyes.
I have been fishing with lightweight rods for many years now, I suggest you go for it - you wont regret it.