CT is pretty well lit. Here are the heavy hitters:
I-84: NY Border to Exit 8 (8 miles), Exit 10-11 (2 miles), Exit 17-30 (12 miles), Exit 33-65 (24 miles). About half of the 97 miles lit
I-91: I-95 to Exit 13 (11 miles), CT 9 to MA (31 miles). 42 of 58 miles lit
I-95: NY to Exit 55 (55 mi), Exit 68-70 (3 miles), Exit 74-81 (4 miles), Exit 82-90 (12 miles). 74 of 111 miles
I-291: Entire length
I-384: I-84 to just past CT 83 exit
I-395: Exits 13-14 (1 mi)
I-691/CT 66: I-84 to CT 10 and CT 71 to end
CT 2: I-84 to CT 94 and CT 32 concurrency through Norwich
CT 9: Area near I-95, Exits 10-18, north of Exit 21 (about 16-17 mi)
CT 8: I-95 to CT 15, Exit 13-17, Exit 24-35, Exit 43-44
CT 15: Very spotty. Only meat Sikorsky Bridge and the Hartford portion.