On 5/9/2016 8:43 AM, Mike Duffy wrote:
On Mon, 09 May 2016 04:27:29 -0700, Don Y wrote:

Note, also, that you might want to consider replacing the incandescent
lamps with LED substitutes.

Yabutt, as has been pointed out for similar (motion detector) switches, if
the switch does not have a white (neutral) connection, then the light
sensor circuit uses the load as a virtual ground, and thus will not
function if the load is not purely resistive.

It;s a "power pack" -- essentially a giant wall wart. It has
line, neutral and (no doubt) earth available to it. You can
switch the *line* connection (via the wall switch) but unlikely
that you'd not have earth and neutral available continuously
at the outlet to which the transformer is connected.

A motion detector light typically is designed to be installed
in place of a light fixture. In which case, you don't have
*guaranteed* access to anything (line, neutral or earth)
so have to "make do", electronically.