On 20/10/2020 12:45, George Miles wrote:

I have several emergency lights over the stairs etc, which light up
when the mains fails.

But if they only last 4 hours, and the power trips when i'm asleep at
midnight, and fire breaks out at 6 a.m. or i need to get up, they
will be flat.

So recommendations for emergency lights with longer lasting batteries
please?

You could increase the capacity of the supplied batteries for longer run
time. Or install a UPS to feed the light - so on power failure the UPS
will supply mains to the light and it will stay off. When the UPS runs
out of juice it will drop mains to the light and it will take over!

(Having said that, you are dealing with two unlikely events power
failure and a fire. You would have to be particularly unlucky to get
both to happen within a timing window that would cause a problem (i.e.
the fire needs to be more than 3hr after the mains failure, but not
before daybreak)


--
Cheers,

John.

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