As a photographer, this information is more applicable to explaining light than most professional photographers! Haha, automotive lighting tutorial for leveling up studio photography. Fantastic video!
I just started my role as an engineer and was thrown into light despite never doing it before , this was the most fantasatic and easy to understand explanation i have seen . thank you and i hope you get the credit deserved for this ,
I’m a proud customer of Diode Dynamics SS3’s. I work in automotive electronics and design for global OEM’s. When I saw the way you explained the relation between lumens, candela and lux, any person will understand clearly. I really appreciate Team Diode dynamics for going into great details while designing and producing awesome lighting products which improve visibility to the driver without effecting the oncoming traffic. Keep going guys,👍 Would like see more products coming from you.
Thank you for being informative and helping customers understand what it is they're really getting! Wish more manufacturers would follow your example of transparency with their products.
Thank you, as usual, Paul, for the very simple explanations - in the hope that consumers get it. Its disturbing to see retrofitters and consumers give in to the hype about lumens, yet have no feedback when the light output is worse than what they had before because of poor the bulbs are not within the specifications that will be optimised within a suitable housing. I'm quite thankful that you and others take the time to provide FACTS and demonstrations.
The gif in the email answered the question so well I almost didn't bother watching an entire video. But I'm glad I did. Thank you for the clear explanations.
Thank you for your explanation, it's easy to understand because I'm looking for a flashlight and i stumbled upon lumens and cd rating and your explanation is on point.
Thank you for this explanation! I’m just a flashlight dork, but this is a great explanation and physics review of how these units of measure work. The overview of the laws governing headlights is very informative too, thanks you!
Just stumbled on you folks. Very clear and understandable explanation. I wish I had know this information before spending decades buying overpriced (but well marketed) junk because I didn't know better.
Well we'd like to welcome you to a brighter nighttime! Feel free to contact us on any of our platforms if you have any questions at all about our product or lighting in general!
Manufacturers like Cree and Osram, Luminus, Samsung, Nichia will also list the viewing angle, or beam width. A good light company will match the led emitter to the task and put, for example a 15-30 degree beam angle in a spot light and one with say a 150 degree emitter in a flood. You can also ask what amperage they got the lumen count from. Also an important number is the candela per lumen ratio. For a headlight, higher is better.
Measuring the light intensity of car lighting at a distance of one steradian of Olbrecht sphere and converting it to candela per square meter. Please share your experiences. B.R Kavei
How do i compare upgrading my fog bulbs with your H11 SL1 1630 lumens vs SS3 SAE/DOT Fog sport lamps with 9050 candela in terms of brightness in that application? Its a 2023 mercedes sprinter. Thanks!!!
Okay, wait, I'm still a bit confused... So if Candela is the most important metric of how effective a lighting system is, if we have the distance, and the lux measurement from a lux meter, we can determine the candela, correct? So given the example: Distance: 10m Lux measured at 10m: 1000 lux Then Candela is: 1000 x (10)^2 = 1000 x 100 = 100,000 Is this correct?
This is simply an additional accent light feature that is optional to wire up, however the backlight feature can elevate your ride above the rest of the crowd and really stand out!
Sir, I want to ask something? When calculating candela, shall we consider the brightest point on the hot spot in the headlamp beam pattern? Otherwise, when we buy lux from a few places, a lot of candela values will emerge! Could you please give some more information? Thanks
Great question! Most companies describe a pattern in terms of maximum candela - the point where candela is the highest. You could also describe the candela at the exact vertical/horizontal center. From there, specific points can be referenced in degrees. For example, (-4, 2) would mean four degrees left, and two degrees up. You are correct that every point will be different in candela value.
Nice to meet you! I did not study a university on this subject, but I very love automotive science. I'm happy to learn something thanks to you and youtube. Thanks
This is awesome information. I have a few questions based on the video. Since there is a minimum candela requirement for each degree plotted in the beam pattern, this made me wonder, are there maximums to this as well? For example the 15,000 candela converts to about 245m or 800ft. Is there a point where regulations would say something like "can't have candela over 30,000 anywhere in the beam"? I'm wondering if the limit to how bright a light can get is based on the technology available at the time or regulations themselves? I have your fog lights for my WRX and love them, the quality is amazing and they are so good, I delayed getting new headlights for my car. I'm hoping Diode Dynamics comes out with a full Headlight Housing for that purpose soon :) Also would be interested in a video on CRI and CCT and the possibilities this brings to headlights for automotive uses. I'm a huge car guy that recently has been learning about flashlights so it would be cool to see how the two blend together haha
Hello - yes, depending on the type of lamp, there are overall maximums that exist as well as specific maximums at certain points. This is most commonly implemented to ensure there is no glare shining towards other drivers. The limit to how bright a light can be is based on the regulations, however, you can always shine more light into specific areas where there is no maximum. So, the goal becomes careful focus to deliver as much lights as possible in the right areas. For more information, please see our newest video on LED Optics!
I'm sure this is going to be one of those moments I look back and shake my head at myself, but. I am having trouble with your equation values. 251000 Candela equals 0.25 Lux at 1001 meters. To make it work I need to convert the .25 into 250? Am I missing something? Do I need to move the decimal 3 places on all Lux values to get Candela? as in 1 Lux would become 1000. Or convert meters to milimeters. Great info though and thx
Nice video! Something triggered me to understand the connection between candela and lumen. As a matter of fact... I will use this knowledge next time, when a customer ambushes me in the "lighting department" and asks something about lumen (FFS... I am in logistics) :D! I will go on a tangent, nuclear style! ;D
