motion sensor security lights

[dacflyer]

i have several of these light around my property. they have worked very well over the years.
i have had a few models that were pure crap ( i'll never use anything by Regent lighting or Cooper )
anyway my question is.. i have had some light sensors start to go bad. the plastic lens covering the PIR sensor starts to go bad, cracking , clouding etc.
i was thinking to use normal plastic, but i have noticed that the old lenses have multiple areas of small fresnels i am guessing it is to make it easier to pick up movement signatures.
but i cannot find anything to replace this material.. am i just going to have to replace the whole unit ?
or does anyone know where i might find new lens material ?

[Dean Huster]

Generally, the lens portion is to determine where the detection will be the greatest so that a cat or dog will not trip it but a human will. I'll bet that a new light will be nearly as cheap as a replacement lens which may not be available anyway. Lighting products tend to have a very short "lifetime" regarding style. Run through your big box store and you see that virtually none of the lighting models are available much over two years in a row.

[Externet]

Depending on the dimensions of your lenses, these may fit:

http://www.3dlens.com/infraredfresnellens.htm

http://resolutionproducts.com/products/ ... tectorpir/

Unable to discern if lenses are sold here:
http://www.paradox.com/Products/default ... UBCATID=82

http://www.glolab.com/pirparts/pirparts.html

http://www.homesecuritystore.com/p-1525 ... ensor.aspx

Miguel

[dacflyer]

wow. thanks for the links.. the 1st one is the best.
i'll do some measuring and see what will match the best.. otherwise it till go in the trash.
thanx..