Question 1

What are two directives refers to LPD?

Accepted Answer

ASHRAE 90.1-2019 and IECC C405 are two building energy codes and standards widely used in the United States to regulate the energy efficiency requirements of buildings.

ASHRAE 90.1-2019(which replaces the previous ASHRAE 90.1-2016 version) was developed by the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) to set minimum energy efficiency standards for the design and construction of buildings. It covers all aspects of building systems, including lighting, HVAC(heating, ventilation and air conditioning) and envelope requirements.

IECC C405, on the other hand, refers to the energy efficiency requirements outlined in the International Energy Conservation Code (IECC). The IECC is a model code developed by the International Code Committee (ICC) that provides minimum requirements for the energy efficient design and construction of buildings. Section C405 specifically specifies energy efficiency requirements for lighting systems, including lighting power density, lighting control, and daylighting regulations.

Both ASHRAE 90.1-2019 and IECC C405 aim to improve the energy efficiency of buildings and reduce energy consumption. These standards provide guidelines and mandatory requirements for building designers, architects and contractors to meet specified energy efficiency targets. Compliance with these codes ensures that the design and construction of buildings operate more efficiently and reduce environmental impact.

Question 2

What is the lighting power density watts per SF for IECC 2015?

Accepted Answer

According to the 2015 IECC(International Energy Conservation Code), lighting power density (LPD) requirements are specified based on watts per square foot (W/sq ft) of different building types and Spaces. Here are the LPD values for some public Spaces:

Office Buildings:Retail Buildings:Open Office: 0.97 W/sq ftSales Floor: 1.39 W/sq ftConference Room: 0.81 W/sq ftStorage Areas: 0.59 W/sq ft

Please note that these values are general guidelines and the final LPD values are recommended to refer to the actual regulations or to consult the project for accurate and applicable lighting power density requirements.

Question 3

What is the power density of lighting?

Accepted Answer

The power density of lighting refers to the amount of power consumed per unit area of the lighting system. The power density of lighting is usually measured in watts per square foot (W/sq ft) or watts per square meter (W/sq m). The power density of lighting represents the amount of electricity required to provide lighting for a given space.

The power density of lighting varies greatly with the type of lighting technology used, and the lower the efficiency of the lighting device, the higher the LPD value will be when using the modified device. On the contrary, with advanced LED technology, we often use lower wattage to achieve the required lighting requirements, that is, the LPD value is relatively low. It can be seen that the lighting power density is a simple screening measure, and its size indicates whether the space is energy efficient.

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LED Street Light

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Led Flood Light

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LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

LED Canopy Light

Led Bollard Light

Lighting Accessories

Smart Systems

Simulation Design

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