I dunno how a light bar can be a battery drain given it's LED which uses bugger all power. I'd say speaker probably drains more power than the light bar, which is also quite well utilised in inFamous.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix