Faintly lit? (5)
(Other definitions for tipsy that I've seen before include "Woozy" , "affected by drink" , "A bit drunk" , "Inebriated" , "Slightly drunk" .)
(Other definitions for dim that I've seen before include "Obscure, not bright" , "Not bright, poorly lit" , "Lacking clarity or distinctness" , "Unpromising" , "Providing little light" .)