What is the Cosine Rule for Lighting? How to Calculate Light Levels at an Angle from the Source
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- čas přidán 4. 07. 2024
- In this video we look at how to calculate light levels at a point that is not directly below the light source. We look at the cosine rule for illuminance or lighting, it involves knowing the angle from the light source to surface and how this fits in with the inverse square law.
These videos are designed to help learners who are studying any kind of electrical course including City and Guilds 2365, 5357 and 8202 as well as the EAL Diploma in Electrical Installation.
#joerobinsontraining #Electricaltrainingvideos #scienceandprinciples
I just want to tell you, Joe. I recently took a job as an agent for lighting companies in the United States. I've spent the past two months cramming every bit of knowledge I could into my brain -- about lighting and electricity. None of my college education was in technical fields, so I felt at a bit of a disadvantage. After two months of doing this for 10+ hours a day, I have learned a lot from various sources. But none as much as from your series -- which I've watched most of the way through twice. Even though much of your series doesn't directly relate to lighting, it's amazing to me how helpful it's been. I was a professional educator myself for 25 years, and I have to say that I've never seen anyone more talented at it than you are. Thank you so much for posting these!
Oh wow, what a great comment, I'm so glad thay you're finding them helpful Paul, there's some more lighting content on the way so stay tuned. Again thanks for the comment, it's this kind of thing that keeps me going. 😊
Good morning, Mr Joe. I will continue to thank you for your time, great mind and your intuition and support you have towards helping others. Thank you for doing this video too..
Thank you.
My absolute pleasure, glad it helped!
This was so well explained, thank you!!
Ah thanks for the explanation, glad to have this subject as an elective in my undergrad degree.
Good Effort , It's been really Helpful, THANKS
very good and clear explanation, thank you!
Great! „What we're interested in is the angle from perpendicular“.
Thanks for more excellent tuition Joe 🙏
My absolute pleasure Linda.
Thankyou so much for this
in case you want to use the height , simply multiply by "cos(theta)^3" instead of "cos(theta)"
Thanks for the tip!
Easy and clear explanation.
Thank you! More on the way!
Thanks
Can you do a course on determining the luminous flux of a lamp?
amazing video from the U.S
Thank you, check out my other videos and stay tuned for more!
Thanks for the video Joe. I'm glad I invested in a scientific calculator 😎
It'll pay for itself Richard!
Great video!
Something I've been struggling with for a while, maybe you can help. When you changed the angle of incidence from the torch, the pool of light changed into a more elliptical shape. I'm looking for a mathmatical way to determine the major axis of that ellipse, given the beam angle, distance, and z-angle.
Practical example: a theatrical spotlight pointed at the stage, from a position out over the audience.
I've found a geometric way to do it with some basic trig, but I'm specifically interested in the relationship between z-angle and the major axis. (Eccentricity?)
Any help is greatly appreciated!
Can you do.. Calculations of shunt resistor and multiplier resistor
Good video Joe. When I did this long time ago we kept the original height (d) the same even for working out the angles? Is this a newer way. Don’t suppose it makes a huge difference 👍
Cheers Matt, you definitely need to use the distance from source to surface in a straight line, not just the height!
E is illuminance?? Thanx for the upload
Hi i have a question, Why other formula for Illuminance is look like this E=(Icos²X)/(d²) Thank you for your time. Have great day 😁
hi how would u calculate the illuminance at a point when 2 lamps are on, given the angle, distance and the luminous intensity of the 2 lamps?
Like this... czcams.com/video/N0ohNNAJoKc/video.html hope it helps. 😊
How to calculate illuminance between two lamps
Great question, try this video:
czcams.com/video/zCCW2K6qaYM/video.html
Hope it helps. 😊
Im about to finish my math degree in portugal and i need help calculating veiling luminance calculation in a road can you help me ? i got 2 weeks
I'm learning this for illustration, II need to have more realisitic lighting lmao
11:57 I thought you used COS already , then you stick with 4 meter instead of 5 meter?