Not much needs to be said about lighting during 
a power outage. Modern LED or CFL lights use
relatively insignificant amounts of power unless
deployed in absurd excess. We've become accustomed
to very high levels of illumination, in an outage
it pays to let our eyes dark adapt. 

Small LED headlamps are extremely useful to help
minimize the need for area light and to get things
set up if caught by surprise in a blackout. I'd
suggest those with rechargeable batteries, either
internal or, better still, replaceable so that
batteries can be swapped out and recharged separately.

Traditional hand-held flashights are better than nothing,
but otherwise of little use compared to headlamps.

I'd studiously avoid use of open flame lights unless
absolutely nothing better can be had. Enclosed flame
lights such as hurricane (Dietz) lanterns are safer
than open flames but apallingly inefficient. It's
probably better to add the lamp oil to the generator
fuel. Pressurized white gas mantle lamps are a bit
better, but I'd still put the gasoline in the genny,
or save it for when the generator won't start..

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