Wikipedia says the opposite about low-pressure sodium lamps: High pressure sodium has additional phosphors and Sodium electron excitations and is a whole different ball game.

Sodium bulbs need time to warm up, right? So they wouldn't work in a set-up where the ON cycle is only 15-30 seconds?

Try Black Tape...
 

Another approach to this problem could be the judicious use of black tape on the bottom of sensor window, so that the short critters (dogs & cats) can't be seen, but the tall ones can be seen.

It worked on my neighbors garage light, which blinded me any time I went out into my back yard. We put the tape on the side of the sensor so that IR movement in my backyard is not seen, but IR movement in his yard is seen.

-AC_Hacker

The Facts About Energy Efficient Light Bulbs
 

hey doaz,
your article is very interesting.

Yes I agree, almost everything in the stores here are now LED. You could hardly find CFLs anymore since they are being phased out. Floodlights, spotlights, pinlights, dimmable lights, everything I see at the home depot are LEDs. and very efficient ones at that.

How efficient are your very efficient LEDs? The ones here its hard to find something much higher than 50 lumens per watt.

Well I just persuaded the village association to replace the streetlamps with LEDs..and they purchased 7w LEDs to replace those 40w CFLs they used previously and have noticed no difference in lighting at all..streets are still well illuminated

I used the word very efficient since they consume less power than the 40 watt CFLs that were previously used..and yet light up the same area effectively