Category Archive for: «Lighting»

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8 NEC Basic Feeder Circuit Sizing Requirements

Feeder circuit loads Once the branch circuit loads are calculated, the feeder circuit loads may be calculated by applying demand factors to the branch circuit loads. General Lighting Loads (Article 220.42) Show window or track lighting (Article 220.43) Receptacles in other than dwelling units (Article 220.44) Motors (Article 220.50) Fixed Electric Space Heating (Article 220.51) […]

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An example of calculating the number of indoor lighting fixtures

Input information These are the input data for the following calculation: An office area has length: 20 meter; width: 10 meter; height: 3 meter. The ceiling to desk height is 2 meters. The area is to be illuminated to a general level of 250 lux using twin lamp 32 watt CFL luminaires with a SHR […]

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Visual Tasks of Typical Living Room Lighting

Flexible Lighting Design Solution Most living rooms require flexible lighting design solutions because they serve a broad variety of changing functions. The lighting in a typical living room should comfortably serve small group conversation, larger social gatherings that include casual eating and drinking, and more solitary activities such as reading, music listening, and TV viewing. […]

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Hospitality lighting design, Why it matters

Achieving Required Lighting Level The hospitality business involves serving people and giving them enjoyment. From restaurants to hotels, resorts, and even theme parks, facilities are designed with the intent of transporting guests from the world of the ordinary to a special time and place. Lighting design for hospitality projects is, along with retail lighting, the […]

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Brightness, Lamp Life and Efficiency of LED Fixtures

Introduction A typical LED fixture comprises four major component parts: an LED emitter, the fixture’s heat sink, driver and dimming control, and augmenting optics. The emitter includes the die, a thermal heat sink, lens, and outer package (Figure 1). The die is the actual LED chip within the emitter. The color of the light is […]

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Lighting Circuits Connections for Interior Electrical Installations (3)

Continued from 2nd part: Lighting Circuits Connections for Interior Electrical Installations (2) Emergency lighting circuits The main reason for installing an emergency lighting system is to enable the building to meet fire safety legislation in a way that is visually acceptable and meets the user’s needs for ease of operation and maintenance. Consequently it is […]

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Lighting Circuits Connections for Interior Electrical Installations (2)

Continued from first part: Lighting Circuits Connections for Interior Electrical Installations Introduction In modern internal electrical installations, domestic and professional, there is a need for lighting installations in staircases and installation of emergency lighting that will operate in the event of interruption of electricity supply from the grid. The automatic staircase timer abolished Aller – Retour […]

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Lighting Circuits Connections for Interior Electrical Installations

Introduction Electrical lines which include lighting circuits begin from the main distribution panel of the installation and each line contains three conductors: phase, neutral and ground. All three conductors reach to the terminal point of each luminaire and if it has a metal chassis the ground should be connected in the appropriate position. From each […]

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How to Dim LED Lighting in the Home?

Introduction LED lighting in the home is becoming more popular due to the energy and money saving benefits it offers over traditional halogen lighting. One of the most common problems that an electrician faces when installing LED’s is enabling them to dim. Resistive Dimming Resistive dimming has become a standard way of dimming halogen lighting […]

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Difference Between Diffuse and Directed Light

Introduction Having dealt with light quantity, conside-ration must be given to the quality of light, the difference between diffuse light and directed light being one of the most important aspects. We are familiar with these different forms of light through our everyday experience with daylight – direct sunlight when the sky is clear and diffuse […]

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