For the first mission using the lamp, I'm also doing a lightmap. I was doing them before but they ate a LOT of memory quickly, so I reserved them for levels that actually NEED them.
The upper level is lit and if the lightmap wasn't included, I'd either have to do real time shadows (huge no-no for mobile), or not have the darkness at all. And since you're clearing fluffs from a catacomb...well, they SHOULD be dark right? :D
I need a better lamp though...I was aiming for a glowing orb on a chain but I suck at making chains. Maybe I should ask an artist for help.
I found a GREAT coffin model though :D