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Product Related Questions

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What are the measurements of the oversized wall plates?

What are the measurements of the oversized wall plates?   Oversized wallplates are 0.75 inches higher and wider than standard wallplates. They are used to conceal greater wall irregularities than those hidden by the extra coverage provided by Midway wallplates. All 1-Gang Oversized wallplates are 5.25" H x 3.5" W. Add 1.8125" for each additional gang.

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What is LED? Light Emitting Diode (LED)

A solid that directly converts electrical impulses into light. Some LED's today incorporate fluorescent materials to change the color characteristics of the emitted light.

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When is Scotopic?

Vision where the rods of the retina are exclusively responsible for seeing, typically like the light levels in the countryside on a moonless, starlit night.

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What is a Metal Halide Lamp?

A high intensity discharge light source in which the light is produced by the radiation from mercury, plus halides of metals such as sodium, scandium, indium and dysprosium. Some lamp types may also utilize phosphor coatings.

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American to Canadian Currency Converter

Actual conversion rates may differ and does not include taxes, duties and other additional fees

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Linear Calculator

                                How much area do you have?                                                                  &nb...

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Why do fluorescent lamps need a ballast?

Why do fluorescent lamps need a ballast? Ballasts are used to regulate the current in the lamp. Current needs to be regulated in order to supply the right amount of power needed to make the arc, and thus the light, in a fluorescent lamp. Fortunately, the current is lower than that needed for a typical incandescent. This is the reason why the fluorescent lamps can provide the same light output for less energy than typical incandescent.

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What is the difference between line voltage and low voltage?

What is the difference between line voltage and low voltage? Line voltage in the United States is 120 volts. It is the voltage that is supplied to your home or office. Low voltage is less than the supplied voltage. Some lamps, like MR16 lamps, run on low voltage. Getting low voltage to lamps requires that the supplied electricity (at 120 V) passes through a transformer to reduce it prior to operating the lamp.

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What is the Hot Restart Time?

What is the Hot Restart Time?  The time it takes for a High Intensity Discharge lamp to reach 90% of the light output after going from on to off and then back on.

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What is the National Stock Number?

The standardized part number used by the US Government for procurement.

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What is a High Efficiency Magnetic Ballast?

The proper term, High Efficiency (Energy Saving) Electromagnetic Ballast, is a ballast with a core & coils, designed to minimize ballast losses compared to the "standard" ballast.

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What is BTU?

What is BTU? BTU or British Thermal Unit, is a unit of measure for heat value. The higher the BTUs a device is capable of outputting the more powerful it is.

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Where can I find lighting disposal policies and contact information for my state or province?

Please refer to your state policy. In most states, fluorescent and compact fluorescent light bulbs used at home can be disposed of in the same way as regular light bulbs. While all fluorescent bulbs contain a trace amount of mercury, the quantity is so minute that disposal is not regulated by federal standards (established by the EPA, the Environmental Protection Agency). You would have to dispose of an incredibly large amount of fluorescent bulbs — around 360 4-foot fluorescent ...

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What is Open Fixture Rated?

Lamps that are approved for burning in open fixtures (as opposed to enclosed fixtures which have an acrylic lens or plate glass enclosure).

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What is Light Pollution?

Light that is directed to areas where it is not needed, and thereby interferes with some visual act. Light pollution directed or reflected into the sky creates a "dome" of wasted light and makes it difficult to see stars above cities.

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What is the Ignitor for?

An Ignitor is an electronic device providing a high voltage pulse to initiate an electrical discharge. Typically, the ignitor is paired with or is a part of the ballast.

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What does HPF mean?

A ballast whose power factor is corrected to 90% or greater by the use of a capacitor is a HPF ballast.

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What is National Electric Code (NEC) ?

National Electric Code (NEC)A nationally accepted electrical installation code to reduce the risk of fire, developed by the National Fire Protection Association.

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Where can I find information on using light to treat seasonal affective disorder (SAD)?

Seasonal affective disorder (or SAD) is a form of depression caused by the lack of sunlight. It usually occurs in winter when natural light levels decrease. A common treatment for this condition is phototherapy, in which a light box is used to expose the patient to high levels of light for prolonged periods. Because of the high level of light used and the risk of eye damage due to ultraviolet radiation exposure, people who may be suffering from SAD should consult a health professional,...

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What is a Nanometer?

A unit of wavelength equal to one billionth of a meter

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What is CFM?

What is CFM? CFM (Cubic Feet per Minute) is the standard of measure for devices such as ventilation fans. The higher number of CFM a fan has the more air it is able to move in a given period of time.

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What is Static Pressure?

What is Static Pressure Static pressure is a measure of the resistance against airflow as the fan pushes air through a duct. It is measured in inches of water column or water gauge, such as 0.25" w.g. to show that resistance is equal to a column of water gauge. It is expressed as 0.1" w.g. or 0.25" w.g. to show that the resistance is equal to a column of water one-tenth or one-quarter of an inch tall.

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What is the Hot Restart Time?

The time it takes for a High Intensity Discharge lamp to reach 90% of light output after going from on to off and then back on.

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What is Light Loss Factor?

The product of all factors that contribute to lowering the illumination level including reflector degradation, dirt, lamp depreciation over time, voltage fluctuations, etc.

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What is a Mercury Lamp?

A high-intensity discharge light source operating at a relatively high pressure about 1 atmosphere and temperature in which most of the light is produced by radiation from excited mercury vapor. Phosphor coatings on some lamp types add additional light and improve color rendering.

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What does HPS mean?

HPS means High Pressure Sodium.  HPS lamps are high intensity discharge light sources that product light by an electrical discharge though sodium vapor operating at relatively high pressures and temperatures. 

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What is a Kelvin?

Kelvin is a unit of temperature starting from absolute zero, parallel to the Celsius (or Centigrade) scale. 0C is 273K.

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What is Open Circuit Voltage (OCV)

Open Circuit Voltage measured across the socket the lamp screws into, with the ballast powered on. It is dangerous to stick a voltmeter into such a socket without precise knowledge of the ballast because exceedingly high voltages could be present.

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What are Lumens?

A measure of the luminous flux or quantity of light emitted by a source. For example, a dinner candle provides about 12 lumens. A 60-watt Soft White incandescent lamp provides about 840 lumens.

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What is the Maximum Overall Length?

The end-to-end measurement of a lamp, expressed in inches or millimeters.

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