> Thanks, that's good to hear

Hey, don't mistake me for an expert !! ;-)

"8 Year Standard Warranty"

http://www.imexcom.com/p2-electrical-photo.html

Silicon vs CdS

http://www.precisionmulticontrols.com/PDFdownload/Sulfidevssilicon.pdf

http://www.selcoproducts.com/CFM/photocell_toc.cfm

http://www.selcoproducts.com/CFM/photocells/photocell_PDF/Selco_PhotoCells_C
onstruct.pdf

OPERATING LIFE

Figure 13 illustrates the change in illuminated resistance (at
10 lux) of CdS cells with operating time, showing slightly
increasing curves. If used within the maximum ratings specified
in this catalog, the CdS cell recovers from this time change and
maintains stable values for quite a long period. Exceeding the
maximum ratings can cause deterioration or damage. If this is
kept in mind, the life of CdS cells can be expected to be quite
long

http://www.selcoproducts.com/CFM/photocells/photocell_PDF/Selco_PhotoCells_p
recautions.pdf

Use at high temperature and humidity shortens the cell life and
should be avoided

Avoid usage that exposes the CdS cell to strong ultraviolet light

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