The electrical department of any large hardware store such as The Home Depot or Lowes sell replacement photocells.
Light heats a photocell, and the difference in temperature creates an electric current(:
light of a cell
When light strikes a photocell, the resistance decreases, allowing current to flow more freely.
There are many places to purchase outdoor ceiling lights. You can purchase outdoor ceiling lights online at Home Depot, Lowes, Seagull Lighting and Overstock as well as bellacor. You can also walk into all of these stores and purchase outdoor ceiling lights.
There are many places where one can buy an outdoor spot light. One can purchase an outdoor spot light at popular on the web sources such as Amazon, eBay, and the Home Depot.
One can purchase the 915P026010 replacement light from 'Amazon' where it is available from $44.95. One can also buy this item from both 'Sears' and 'eBay'.
One can purchase fibre optic outdoor lighting from the following sources: Lamp and Light, QVS Direct, Fibre Optics Products, Unlimited Light, Universal Fibre Optics, Mica Lighting.
photovoltaic cell, photoelectric cell, photocell
It will if it can not 'see' the light.- ie, if there is a shade or something between it and the light.
photocell
photocell
Any photocell can be used as detecting light or NOT. It is just an inversion.