Useful Terms
Luminaire - "a complete lighting unit consisting of a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps, and to connect the lamps to the power supply", according to Engineered Products Company; a complete lighting unit which contains a lamp, housing, ballast, sockets and any other necessary components
Ballast - a device placed in line with the load to limit the amount of current in an electrical circuit.
LED Driver - An electronic device which converts input power into a constant current source despite fluctuations in voltage. It protects LEDs from voltage fluctuations. In simple terms, an electronic device which feeds input power to LED to produce light. Ballast Factor - A ratio used to calculate the expected real-world performance of a lamp. Calculated as the difference between the expected performance of a lamp with a commercial ballast versus the measured performance of that lamp with a reference ballast. Rated lamp lumens x Ballast factor = Net lumens Heat Sink - A component or integral part of a luminaire that conducts or convects heat away from LED components. Lamp - the source of light in a fixture, commonly referred to as a “light bulb” Light Fixture - an electrical device used to create artificial light by use of an electric lamp
Daylight Sensor - A device which senses the amount of daylight in a room and controls the luminaire accordingly. Occupancy sensor - A device which activates a fixture upon sensing the presence of a person. Occupancy sensors may be separate from the fixture on a wall or ceiling, or integrated directly in the fixture. Downlighting - Light which is cast downward from a fixture. The most common form of direct lighting. Incandescent - an electric light with a wire filament heated to such a high temperature that it glows with visible light.
Fluorescent - a low pressure mercury-vapor gas-discharge lamp that uses fluorescence, the emission of electromagnetic radiation, to produce visible light.
LED - Light Emitting Diode. LEDs produce light through the use of a semiconductor that emits light energy when an electrical current is passed through it. LEDs are the most efficient bulbs. They use 90% less energy than traditional incandescents and can sometimes pay for themselves through energy savings in a couple years or less. LEDs claim to be ultra long lasting - lasting for 25-30 years depending on the product. LEDs give out their light almost instantly when you flick the light switch. Foot Candle (FC) - A unit of measure for the density of light as it reaches a surface. One foot-candle is equal to 1 lumen per square foot. Lumens - a unit of luminous flux; overall light output; quantity of light, expressed in lumens Lux - a unit of luminescence equal to 1 lumen per square meter Color Temperature - Color temperature, measured in degrees Kelvin (K) is a way to describe the appearance of a light on a scale from warm to cool. Lower Kelvin color temperature means a warmer, more inviting color. Higher Kelvin means cooler light which is good for security uses or to enhance focus. Kilowatt-hour - a measure of electrical energy equivalent to a power consumption of 1,000 watts for 1 hour (an amount) Watt - measurement of electrical power, equivalent to one joule per second (a rate) Input Watts - The total wattage required by both the ballast and the lamp in a luminaire Payback Period: The length of time required to recover the cost of an investment. In a lighting retrofit, this will be the length of time before energy savings from the new fixtures recover the initial cost of purchasing and installing the fixtures. |
Source: Wikimedia Commons
Source: Chanzon on Amazon
Source: Ali Express
Source: Bulbs The LED Authority
Source: Garden Trading
Source: Minecraft Computer Wiki Source: Delightfull Unique Lamps
Source: Eagleview Security
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Equations
Lighting Retrofit Manual from Electric Power Research Institute, April 1998
Contact Harlo Pippenger at [email protected] with questions or interest!