What is LUMINANCE? (and Candela) | Optometrist Explains

[@maryannlupus2187]

This is a lot of info to take in and you explain it very well. The idea is fairly simple, it’s the specifics that are new and confusing to the average person. You make it make sense. I’m extremely glad I found this video and your channel, I love what you do!!!

[@triniayman]

LOL I love it, SI units are like the old school avengers! Love how you zipped by the animation for the mole too! lol

[@avrycfan69]

This was exactly what I was looking for. Thanks!

[@AntonioTheOptom]

Glad you found it! 😂👍

[@dominicestebanrice7460]

You're correct....it's most certainly NOT simple.....but you did great, certainly better than the twenty or so other people I've watched who've had a crack at this. And I'm learning that not only is this field intrinsically complex but it turns out that physicists and astronomers use the same terms to mean different variables!

[@Amimegrisi]

that was educational and fun! you're so talented

[@triniayman]

Great educational and entertaining video! Keep it up!

[@vuhan8277]

Very Nice presentation I like it.

[@nicolasrodriguez1840]

Great explanation and video!

[@ogphoenix8965]

WOW! Quite amazing

[@AntonioTheOptom]

Thank you!

[@aymenbashir2387]

WOW, awesome explanation

[@paternyao]

I like your presentation style 👍

[@RichRXZ]

Great video! How to understand the per m^2 part of cd/m^2?

[@dsp4392]

You can think of cd/m² as how many "candles" there are on a surface of 1m×1m. This unit is often used to describe the luminous intensity of displays or large lighting panels. Unlike a candle, that is (theoretically at least) a point source of light, monitors and panels emit from a surface. You can multiply the cd/m² specification by the area of the surface to find out the total cd that surface emits. This will give you a measurement in cd. From there, the surface can be treated as if it was a point source itself. So for instance, if you had a 0.5m² TV rated at 500cd/m², it would emit a total of 250cd. Since TVs emit light on a 180° angle (no light behind), they cover 2π steradians, and so your TV would have a luminous flux of 250cd × 2πsr = 1571 lumens.

[@fdvdf5612]

This helped a lot 👍

[@AntonioTheOptom]

Thank you!

[@saikhu_]

this was a quiet demonstration

[@AntonioTheOptom]

Sorry for the poor audio!