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2. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   By comparison, a 60-watt household incandescent lamp will produce about 900 lumens. The luminous efficacy or lumens produced per watt of input of flashlight bulbs varies over the approximate range of 8 to 22 lumens/watt, depending on the size of the bulb and the fill gas, with halogen-filled 12-volt lamps having the highest efficiency.

3. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   All have 1.25 volt DC filaments and directly heated cathodes. Some specify which end of the filament is to be powered by the positive side of the filament power supply (usually a battery). All have glass bodies that measure from 0.285 to 0.400 inches (7.2 to 10.2 millimetres) wide, and from 1.25 to 2.00 inches (32 to 51 millimetres) in overall ...

4. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   Light bulbs using coiled coil filaments are sometimes referred to as 'double-coil bulbs'. For a 60-watt 120-volt lamp, the uncoiled length of the tungsten filament is usually 580 millimetres (22.8 in), [76] and the filament diameter is 0.046 millimetres (0.0018 in). The advantage of the coiled coil is that evaporation of the tungsten filament ...

5. Pentax ME F - Wikipedia

   en.wikipedia.org/wiki/Pentax_ME_F

   This lens also had a bulky underslung battery compartment that held four 1.5 Volt AAA alkaline batteries (1.2 Volt rechargeables not compatible) to power the motor. It had 7 elements in 7 groups, was 76.5 mm long, 73 mm in diameter, 87 mm high through the battery compartment, weighed 580 g, had a minimum focusing distance of 1.2 m and was ...

6. Carlisle & Finch - Wikipedia

   en.wikipedia.org/wiki/Carlisle_&_Finch

   In 1897, Carlisle & Finch offered a hand-powered dynamo, capable of lighting a ten candle power, ten volt incandescent bulb, or to run several electrical toys simultaneously. They also offered a water-powered version, which produced a similar amount of electrical power from a water faucet supplying 50 psi (340 kPa) of pressure and could be used ...

7. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   Simple LED (Light Emitting Diode) circuit diagram. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.