Power factor for lamps - Revision history

Designing Buildings at 07:29, 17 November 2020

2020-11-17T07:29:39Z

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Editor at 14:29, 8 March 2019

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	* Rights to light.		* Rights to light.
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−	[[Category:Standards_/_measurements]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]]

Designing Buildings: moved Power factor to Power factor for lamps

2018-03-12T10:13:09Z

moved Power factor to Power factor for lamps

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Revision as of 10:13, 12 March 2018

Designing Buildings at 11:53, 28 November 2017

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	* Luminaire efficacy.		* Luminaire efficacy.
	* Rights to light.		* Rights to light.
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Designing Buildings at 16:15, 9 February 2017

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	* General lighting v task lighting.		* General lighting v task lighting.
	* Illuminance.		* Illuminance.
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	* Lamp efficacy.		* Lamp efficacy.
	* Light pollution.		* Light pollution.

Designing Buildings at 13:39, 9 February 2017

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	* Lamp efficacy.		* Lamp efficacy.
	* Light pollution.		* Light pollution.
		+	* Lighting.
	* Lighting energy numeric indicator LENI.		* Lighting energy numeric indicator LENI.
	* Lighting of construction sites.		* Lighting of construction sites.

Designing Buildings: Created page with "According to BRE’s [http://www.brebookshop.com/details.jsp?id=327173 The essential guide to retail lighting]: The term ‘power factor’ is ‘…A measure of the phase diffe..."

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Created page with "According to BRE’s [http://www.brebookshop.com/details.jsp?id=327173 The essential guide to retail lighting]: The term ‘power factor’ is ‘…A measure of the phase diffe..."

New page

According to BRE’s [http://www.brebookshop.com/details.jsp?id=327173 The essential guide to retail lighting]:

The term ‘power factor’ is ‘…A measure of the phase difference between the voltage and current in an alternating current (AC) supply. For lamp types other than incandescent, the voltage and current waveforms are not exactly in phase with one another: thus the volts multiplied by the amperes in the circuit may be higher than the Watts. In such cases, the Watts represent the active power, and the volts multiplied by the amperes represent the apparent power. The power factor is the ratio of the absolute value of the active power to the apparent power. Ideally, the power factor should be as close to unity as possible. A low value of the power factor increases the current load and the energy consumption. Most high-wattage lamp circuits are designed to have a power factor greater than 0.85.’

--[[User:BRE_Group|BRE Group]]

= Find out more =

=== Related articles on Designing Buildings Wiki ===

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* Daylight lighting systems.
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* Extra-low voltage lamps.
* General lighting v task lighting.
* Illuminance.
* Lamp efficacy.
* Light pollution.
* Lighting energy numeric indicator LENI.
* Lighting of construction sites.
* Luminaire efficacy.
* Rights to light.

[[Category:Standards_/_measurements]]