a person should always have very bright lights for night riding in my opinion, the tail light should be extremely bright if possible also, some of the dinky little tail lights wont cut it, but the larger ones that flash are good because I sure dont want to get run over from behind by someone who couldnt see my light.
I like a bright long distance head light because a moyor bike move so much faster, those big pot holes or something in the road can be under the front rire before you know it if you cant see at least 40-50 yds out ahead.
only problem I have had eith the 1600-1800LM lights Ive bought is that the LED lights screw up my digital speedo when the lights are on,they jack with the wired and the wireless ones Ive used, I wish I knew of a good way to shield them from that interferene.