I agree but it does depend how dark, some go overboard and the rear lights are black and all but useless. A light tint where they are still viable from a set distance and legally you should be fine. Just find out what those legal requirements are if you're worried.
Mine are tinted so light unless you looked at them side by side with a stock CJ you would not know but it does make a difference to the look.
Or just get some LED rear lights from about $200, there are lots to choose from.
http://www.ebay.com.au/itm/Smoked-LED-T ... 35d687213d
Like I said there are many others.
Tinted side indicators for about $30 on eBay. The side lights are an easy 5 min DIY swap.
http://www.ebay.com.au/itm/MITSUBISHI-C ... 256f9c788c
Not sure is I like the Brake light sticker with LANCER on it, but each to there own.
Edit - here is a smoked 3rd brake light for $170.
http://www.ebay.com.au/itm/MITSUBISHI-C ... 2ec4d0a3f1