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Light levels and Photometric units

About candelas, lumens and luxes

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In this lecture we cover the science of visible light via the Photometric units. We explain the candela and lux units, and how they are measured. We show the complete scale of illumination levels, from Scotopic star-light levels, up to the maximum Photopic levels of 100,000 lux.

We also compare the various sources of light and their luminance levels, and pay attention to the invisible, infra red, radiation.

P.S. Please note that all prices are US$, as the Teachable platform is offering PayPal payment only with this currency.


Your Instructor


Vlado Damjanovski
Vlado Damjanovski

Vlado Damjanovski is an internationally renowned CCTV expert, published author, trainer and App developer with over 37 years industry experience.

With an Honours degree in Electronic Engineering, Vlado authored the industry’s ‘CCTV bible’, CCTV - from light to pixels (4th ed), also available in Korean, Russian and German. The ViDi Labs Academy video lectures are based on these books.

Vlado has been producing industry specific test charts for over twenty-five years and offers a complete IP camera evaluation and measurement service compliant with the IEC standards. His recent work has been the development of software for automated camera analysis to suit the latest ViDi Labs test chart.

Furthermore, Vlado has developed unique App - ViDiLabs calculator - which is available for installers, integrators and consultants to assist in finding optimal camera settings (for iOS and Android).

Vlado has helped develop the Australian and New Zealand CCTV Standards (AS4806) in his capacity as chief contributor. He is currently a member of the IEC TC-79 group where he contributes towards the development of the international standards 62676 for IP CCTV.

Vlado now brings you the only complete online study of IP CCTV technology, anywhere in the world, based on his books.


Course Curriculum


  Light levels and Photometric units
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