Customize Consent Preferences

We use cookies to help you navigate efficiently and perform certain functions. You will find detailed information about all cookies under each consent category below.

The cookies that are categorized as "Necessary" are stored on your browser as they are essential for enabling the basic functionalities of the site. ... 

Always Active

Necessary cookies are required to enable the basic features of this site, such as providing secure log-in or adjusting your consent preferences. These cookies do not store any personally identifiable data.

No cookies to display.

Functional cookies help perform certain functionalities like sharing the content of the website on social media platforms, collecting feedback, and other third-party features.

No cookies to display.

Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics such as the number of visitors, bounce rate, traffic source, etc.

No cookies to display.

Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.

No cookies to display.

Advertisement cookies are used to provide visitors with customized advertisements based on the pages you visited previously and to analyze the effectiveness of the ad campaigns.

No cookies to display.

All About Optical Systems and Lens Technologies

B カンデラ(光度)

カンデラとは、光源からある方向に放射された単位立体角当たりの光束密度を表す。1カンデラ(cd)は、「光の周波数540×10^12HZ(555nm)の単色放射を放出し、所定の方向におけるその放射強度が1/683[W/sr]である光源の、その方向における光度」と定義される。
語源は、けものの油で作った燭(ろうそく)に由来する。

error: Content is protected !!