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2. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   Efficiency: LEDs emit more lumens per watt than incandescent light bulbs. [63] The efficiency of LED lighting fixtures is not affected by shape and size, unlike fluorescent light bulbs or tubes. Size: LEDs can be very small (smaller than 2 mm 2 [64]) and are easily attached to printed circuit boards.

3. Talk:Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Talk:Light-emitting_diode

   For the rest of this comment I am going to assume an LED is a single P-N junction. Regarding reverse voltage: Most if not all LED manufacturers will list an absolute maximum reverse voltage as 5V. Yet, many people are driving LEDs directly from an AC power line (120V or 240V) with a resistor for current limiting.

4. Street light - Wikipedia

   en.wikipedia.org/wiki/Street_light

   New street lighting technologies, such as LED or induction lights, emit a white light that provides high levels of scotopic lumens. It is a commonly accepted practice to justify and implement a lower luminance level for roadway lighting based on increased scotopic lumens provided by white light.

5. List of obsolete occupations - Wikipedia

   en.wikipedia.org/wiki/List_of_obsolete_occupations

   Lamplighters toured public streets at dusk, lighting outdoor fixtures by means of a wick on a long pole. At dawn, the lamplighter would return to extinguish the lights using a small hook on the same pole. [122] Electric street lighting, which does not require lamplighters, replaced candles and oil and gas lamps. Additionally, gas lighting is ...

6. LED stage lighting - Wikipedia

   en.wikipedia.org/wiki/LED_stage_lighting

   LED instruments can and have been used to replace any conventional lighting fixture, and some shows, such as Radiohead's 2008 tour, have used only LED lighting instruments. [2] However, most shows use LEDs only for lighting cycloramas, or as top, side or back light. They can also be used as 'audience blinders' (lights pointed directly at the ...

7. Mercury-vapor lamp - Wikipedia

   en.wikipedia.org/wiki/Mercury-vapor_lamp

   The ultraviolet light from mercury-vapor lamps was applied to water treatment by 1910. The Hewitt lamps used a large amount of mercury. In the 1930s, improved lamps of the modern form, developed by the Osram-GEC company, General Electric company and others led to widespread use of mercury-vapor lamps for general lighting.