LMAO, some pretty funny replies here.
Before I got my Jeep, I asked a local LEO who I have known for several years. He told me that here in Louisiana, you can not drive on a road with more than four lights on at any given time, 2 head lights and 2 fogs, etc. He told me that LA didn't have any specific laws (that he was aware of) requiring off road lights to be covered while driving on road.
Having said that, I often see trucks driving around with fog/ driving style lights on the brush guard/ bull bar along with both fogs and headlights.
On the rare occasion that I turn on either my bumper lights or A pillar lights, I tend to have my finger hovering over the switch in case I encounter another car. I turn them back off if I even see a hint of a glow from a pair of approaching headlights.
To the OP bottom line, I think you'll be safe from prosecution if you were to purchase an LED light bar.
Exco