On Mon, 3 Dec 2012 01:32:10 +0000, fred wrote:

I suppose an alternative to standards approved emergency lighting in a
non regulated environment is to have an emergency 12V circuit in the
house feeding a number of 12V LED downlighters. The emergency supply
could come from a trickle charged 12V SLA battery with a dropout relay
activating the emergency circuit and lights via the normally closed
contact. Add a status led somewhere for peace of mind.

Sounds a good idea, thanks.