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2. Photoresistor - Wikipedia

   en.wikipedia.org/wiki/Photoresistor

   Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor.The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction.

3. Photoreceptor cell - Wikipedia

   en.wikipedia.org/wiki/Photoreceptor_cell

   A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction.The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes.

4. Phototube - Wikipedia

   en.wikipedia.org/wiki/Phototube

   A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from photovoltaic or photoconductive cells. Phototubes were previously more widely used but are now replaced in many applications by solid state photodetectors.

5. Photodetector - Wikipedia

   en.wikipedia.org/wiki/Photodetector

   Photodetectors may be used in different configurations. Single sensors may detect overall light levels. A 1-D array of photodetectors, as in a spectrophotometer or a Line scanner, may be used to measure the distribution of light along a line. A 2-D array of photodetectors may be used as an image sensor to form images from the pattern of light ...

6. Bulkhead - Wikipedia

   en.wikipedia.org/wiki/Bulkhead

   Bulkhead (stability pattern), a stability pattern used to protect distributed software applications Bulkhead light, a traditionally oval style of light fitting that originated in nautical settings. They are usually weatherproof and have robust casings making them suitable for outdoor or industrial applications.

7. Selenium meter - Wikipedia

   en.wikipedia.org/wiki/Selenium_meter

   The most common use of such light meters is measuring the exposure value for photography. The electric part of such a meter is an electromagnetic measuring instrument which is connected to the anode and cathode of a selenium photo cell that produces more or less electric power when exposed to more or less light. The optical part of such a meter ...