Illumination is the light energy incident on a unit surface area per unit time. What is luminous intensity and luminous flux? We deal with this in our video.

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https://airvoice.global
Airvoice produces comprehensive air quality monitoring networks and services for urban areas; digital twins and monitoring networks to forecast and manage air quality for industries; indoor air quality monitoring and management system for buildings.

https://dnair.in
DNAir brings to the Indian market unique air supply technology for clean and healthy indoor climate. Breathe Himalayanlike air even in Central Delhi.