What Is Luminance?

Phuc Gia® is an organization that provides information and definitions regarding what luminance is to organizations and enterprises, especially consumers who are interested in luminance. When we look at a light source or an illuminated object, we have the sensation of glare. So, what exactly is luminance? Therefore, to gain more useful information about luminance, please refer to the article below by Phuc Gia®!

See more: Capacity Profile Of Phuc Gia Laboratory Corporation

What is Luminance?

Luminance: When we look at a light source or an illuminated object, we experience the sensation of glare. To characterize the ability of a light source or a reflective surface to emit light that causes the sensation of glare to the eye, the concept of Luminance is introduced. The elemental areas of illuminated objects generally reflect the received light differently and act as secondary light sources emitting varying luminous intensities in all directions.

To characterize the relationship of the light source (primary source and secondary source) with the eye, the appearance of the light must be added to the luminous intensity. This relationship can be illustrated by the following observation: for example, a 40 W incandescent lamp essentially emits the same luminous flux, meaning the same intensity in all directions, regardless of whether the bulb is clear glass or frosted glass. However, to our eyes, the clear glass bulb feels more glaring than the frosted glass bulb. Luminance (L) is defined for a given direction of a radiating surface area dS as the ratio of the luminous intensity dI emitted by dS in that direction to the apparent area of dS. We note that the luminance of a radiating surface depends on the direction of observation but does not depend on the distance from the source to the observation point. We will see later that luminance plays a fundamental role in lighting engineering; it is the basis for the concepts of perception and visual comfort. Luminance truly reflects the quality of illumination, whereas illuminance only reflects the quantity of illumination.

Table of Luminance for some common sources.

The luminance of a light-reflecting surface in a specific direction is also referred to as Radiance (or Luminance Factor in some contexts).

Symbol: L

Unit: Cd/m²

Cd/m² is the luminance of a uniformly emitting flat surface with an area of 1m² and a luminous intensity of 1 Cd perpendicular to that source.

Examples of Luminance for some surfaces:

Fluorescent Lamp Surface: 5.000-15.000 Cd/m²

Asphalt Road Surface illuminated with 30 lux: approximately 2 Cd/m²

Sunrise: approximately 5.106 Cd/m²

Midday Sun: approximately 1,5 – 2.109 Cd/m²

The above are the analyses of Luminance that Phuc Gia® wishes to share with organizations. In particular, besides providing information on Luminance, Phuc Gia® is also a leading provider of Logistics Services, Certification and Conformity Declaration Services, Energy Labeling Services, Food Safety Declaration Services, and especially Testing – Certification Services. Organizations in need should contact Phuc Gia® immediately to receive in-depth consultation and comprehensive Customs Services in the quickest and most professional manner!

WHAT MAKES THE PHUC GIA® BRAND:

Phuc Gia® – The Leading Unit Providing Customs Services:

The reasons why all enterprises choose Phuc Gia® as the leading unit in consulting for Food Safety Conformity Declaration and Food Safety Regulatory Compliance Declaration, Energy Labeling, Conformity Certification, Cosmetic Declaration, and Logistics Services:

Phuc Gia® has over 10 years of experience in the industry, and is the first unit with sufficient capability to provide Customs services to over 500 large and small organizations In & Out of Vietnam, including: Sharp (2012); Samsung (2012); Hitachi (2013); Electrolux (2013); Panasonic (2013); LG (2013); Sony (2013); Siemens (2013); Mitsubishi (2013); GE (2013); Haier (2014); Toshiba (2014); Carrier (2014); Philips (2014); HappyCook (2015); General (2015); TCL (2015); Alaska (2015); Casper (2015); Gree (2016); Hải Hà (2016); VinMart (2017)…

Phuc Gia® owns a professional Consultation Team and workflow process, capable of answering all enterprise inquiries, helping customers optimize time, mental effort, physical effort, and minimize risks during the process of goods transportation and customs clearance procedures.

Phuc Gia® is the first & only unit to publicly announce the Global Listed Price on its Website and provide free one-year insurance to customers in the event that State legal regulations change!

FREQUENTLY ASKED QUESTIONS:

Despite our services being in the high-price segment, why is Phuc Gia® still chosen by enterprises as the leading reliable unit for customs services?

• This is a concern shared by many customers before choosing Phuc Gia® as their Customs Services provider.
• Over the past 10 years, Phuc Gia® has served over 500 large and small Domestic and International Enterprises. More than 90% of the enterprises that have used Phuc Gia®’s Customs Services agree that the quality of the Service is commensurate with the money they invest.
• Customers comment that: “The price the Enterprise pays when using Phuc Gia®’s Customs Services is SIGNIFICANTLY MORE COST-EFFECTIVE compared to the time and expense the Enterprise would incur to independently complete tasks such as: self-arranging product testing; self-researching and preparing dossiers; self-working with relevant ministries and departments to finalize dossiers; self-obtaining Customs Clearance permits…”
• Phuc Gia® commits to optimizing your time, mental effort, physical effort, and money during the Customs Clearance process, as well as MINIMIZING RISKS during the licensing process!

For more details, please contact us at:
PHUC GIA LABORATORY CORPORATION
PHUC GIA CERTIFICATION CENTER
PHUC GIA INSPECTION TESTING CENTER

Address: ICD Long Bien, No. 01 Huynh Tan Phat, Sai Dong B Industrial Park, Long Bien Ward, Hanoi City, Vietnam.
Hotline: 0981 996 996/ 0982 996 696/ 024 7779 6696
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