"ARW" wrote in message
...
On 24/04/2019 15:47, dennis@home wrote:
On 24/04/2019 10:30, tim... wrote:
Hi,

My new abode is in a block of flats that has interior lighting provided
by (60) bulkhead lamps which are mostly on 24-7 (with some controlled by
light sensors so as only on when it is dark)

I have been tasked with looking to see if we can replace some of then
with ones which detect movement so that they can be off for the large
parts of the day when no-one needs them

It seems that the style of lamps that we have now is not currently
available and I suspect there will be resistance to having different
style of lamp along the corridor so it's replace all of them or none of
them

Currently the bulls we use are 2 times 7W CFLs and the smallest LED
replacement that can be styled with "Integrated" movement sensor is 10W
so replacing those lamps which will need to remain on 24-7 is going to
be negative (after the cost of installation ahs been taken into account)

So the end result of changing all of the lamps has to result in a very
significant saving from the ones which are going to go on-off overnight,
for this to be worthwhile.

Adding external PIR sensors into the supply is going to be a mess
(especially as the corridor was only recently redecorated and there's no
way that redecorating afterwards can be justified) so is it possible to
obtain just the internal microwave sensors and have them installed
inside the lamps that we currently have - there is plenty of space for
this.

Anybody have an experience of this.

TIA

Tim






You could fit a few wireless PIR sensors and a switch to turn the lights
on.

You don't say how long the corridor is so I have no idea how many sensors
you would need.

Someone would have to swap the batteries every year or two.

At least an ordinary sparky will know how to do it.

Not with the info Tim has provided.

well if I was spec-ing the job differently, I would provide different info

The corridor is about 60 yards long with a T at each end

The lamps are controlled from 2 switches inside a "locked" cupboard near one
end of the long straight corridor, with one switch controlling one end of
the corridor (plus T) and the other switch the other end/T.

There are three or four lamps that are "always on", controlled by a switch
somewhere else (couldn't find it, didn't look too hard).

So, if we could put wireless PIRs in the strategic places to register
movement in each leg of the T and signal back to a controller that replaces
the switches in the cupboard (leaving the ones controlled from elsewhere
always on), that would work

But I didn't think of that because I didn't know you could get wireless
PIRs. I discounted wired ones in this configuration because we don't want
to have to provide a route for all the cables. Obviously, if building from
scratch that's what you'd have (as my moving-out-of-property has)

tim