The pilot arrived at his intended destination about 90 minutes prior to the beginning of civil twilight. He stated that he was cleared to land and subsequently landed off the runway and struck an airport sign, which caused substantial damage to the airplane. He added that requesting for the runway lights to be turned up, better familiarization with the airport, flying a longer approach, or executing a go-around, might have prevented the accident. He stated that there were no failures or malfunctions related to the airplane prior to the accident. Federal Aviation Administration inspectors stated that the pilot had been cleared to land on Runway 1L and misjudged the approach. They reported that the airplane touched down in the grass area between parallel taxiways A and B, near the crossing taxiway G.