Light Bulb Color Temperature - WHAT ARE KELVINS? 2700K, 3000K, 5000K

[@KevinCoop1]

Dustin, I did lighting design since the late 80's and was pretty successful doing it, so I was told. But, you taught me something! I knew it was degrees Kelvin, but did not know the why. Thank you! When discussing color with customers and in my classes, there was a concept that is hard for some to grasp. When you look at an object, that object does not have color in it. Objects or paint have color reflectors, not color. The color you see is coming from the light source. This is why they change color when you change the Kelvin temperatures. Thank you again, Kevin

[@carultch]

It has to do with the temperature of a hypothetical black body, that would glow and produce that particular mix of colors (i.e. spectrum). Since we can't heat tungsten or any other metal to 5600 Kelvin, and have it remain a solid metal, we can't make a sun-spectrum with an incandescent bulb. Other lighting technology is needed, that doesn't require heating a material to glow as an incandescent body. Hence other technology, like LEDs and fluorescent tubes, which don't depend on anything reaching any actual temperature that corresponds to the mix of colors in their spectrum. The sun spectrum essentially defines the balance of colors that make white, to our eyes. This is why 2800K incandescent bulbs appear yellow-ish. The spectrum of a colder body, is dominated with low frequency colors like red and yellow. An alien species from a planet around a red star like Proxima Centauri, might see our incandescent bulbs as a perfect white. An alien species from a planet around a blue star like Rigel, would see our sun, the way we see an incandescent bulb, and would probably be able to see what we call UV light.

[@JaronPope]

oh nice! I get it....never knew what all that stuff meant. Thank you so much Dustin.

[@roberttomsiii3728]

The coldest of cold would be referred to as "Absolute Cold" just for folks who want to look more into that, pbs spacetime.

[@katrinaroschelle1671]

This is a very interesting concept. Thank you for sharing.

[@bobburns1724]

Well said as usual Thanks

[@SupperDadder]

I like the fact that you never said degrees Kelvin. I still remember the day a Pakistani exchange student called out my grade 12 physics teacher for teaching us degrees kelvin. He didnt believe the student at first and apologized the next day after he researched it

[@lenzielenski3276]

BS. Been in the industry for 40 years be it photography/lithography or printing and viewing images and its always been degrees Kelvin except for those that use 'C U Soon' as a way to communicate. As a range of temperature, they are all specified in degrees. .

[@joerostkowski7313]

Everything is on a wave,radio to lights peed, spectrum! Everything! Tesla knew this and understood this. Resistance is measured by heat. You can use a temperature read to actually measure Resistance, most saftey act this way.

[@lenzielenski3276]

@@joerostkowski7313 So, photons aren't packets of light any more! Who knew. ( sarcasm intended)

[@Pan1703]

Спасибо за подарок! Диэлектричесские плоскогубцы от кляйн штука хорошая и полезная. Приятно иметь инструмент от американского коллеги блогера!

[@Gruntled2001]

Dustin, thank you for the gift! The insulated Klein linemans are a great and a really useful tool. I am grateful to receive such a great set of tools from an American video blogger colleague!

[@carultch]

Is "кляйн" how you spell Klein?

[@hg2.]

Thank you for another concise, useful, to-the-point video.

[@s.moeller9543]

Love u too, man! Thank you for sharing your knowledge with us!

[@MrHanowski]

Good vid, but was hoping to SEE the differences in color using 4' LED bulbs.

[@Bikeralldaway111]

Very helpful! I got into selling electrical supplies and your videos help out a lot! Getting to know where the product goes and how it works.

[@tahmed7049]

love this video. So good

[@dsugrim1763]

Very great informative Well informative I now understand Thank you 🙏 Keep up the great work

[@jld3738]

I liked how you explain things very clearly. New subscriber here. Now i know what i'm gonna choose when buying lights. Thanks for this knowledgeable video.. All your knowledgeable videos. Keep it up!

[@tekviper9]

New subscriber found you from Wood Work Life , Thank you for this education !

[@shawnwaterssw]

I was trying to explain this to my coworkers. We were replacing lights in a park, they were worried about the Watts. I told we had to check the lumens & light spectrum.

[@elo5004]

Very well explained. It was simply explained, especially when using the graph on colors. Can U do that with Lumia and Kelvin. Thank You

[@jonanderson5142]

Good Video 👍 IV seen jobs were the bulbs did not match..

[@carmineriganti2333]

well NOW I understand thank you , how's your new shop doing any updates.

[@mdovideo1414]

I like the daylight LED bulbs

[@nobadmojo70]

Thank you for always providing great information in a way that is easy to understand. Having said that, I don't really care for that new rock and roll music and sound bites throughout the video, to be honest. But that's me, I'm transitioning into being a dusty old fart, so take it for what it's worth. It won't keep me from enjoying your great content. As always, thank you for your hard work and insight!

[@ElectricianU]

lol thanks for the input my friend. I have a bizarre taste in music that's kind of all over the place. I'm just doing me and anyone interested in observing it is welcome to form their opinion. Either way I'm going to keep doing me. I'm not in this to please everyone, or to be famous - just here to make some stuff for the guys/girls coming up behind me and trying to make myself laugh in the process.

[@nobadmojo70]

@@ElectricianU poundsignrespect ... I totally understand and respect that. Thank you again for all your time and effort.

[@kecskesadam]

So Do I get it right, that you say the daylight is about 10.000K? This says 5900K en.wikipedia.org/wiki/Color_temperature#The_Sun

[@joshuaboniface]

Yea actual daylight on Earth is about 5900-6000K, but, it's not *exactly* the same as colour temperature for lamps. Technically speaking, colour temperature is about the colour of light that comes off an idealized "black body radiator", which is just some bit of matter (metal, rock, etc.) that is glowing because of its temperature. That's why it's a temperature scale (K) which is used - that's the temperature this ideal radiator would have to be to produce light of that colour. The sun is pretty close to an ideal radiator, since it is a glowing ball of thermonuclear plasma. So, it's a very broad-spectrum light around 6000K, which is roughtly the surface temperature of the sun. A hotter star like Rigel (en.wikipedia.org/wiki/Rigel) is much closer to 10K and is thus very blue, and a much cooler red dwarf star would be very red. Fluorescent gas lamps however don't produce the exact same spectrum as a black body radiator, however. Since as Dustin mentioned each gas produces some very specific frequencies of light, the goal in producing lamps is to approximate a colour temperature through various gasses and phosphors. These approximations are the labeled as the lamp's "colour temperature" for visual purposes.

[@lenzielenski3276]

You left out THE most important parts. Unless people have some basis for reference the numbers are meaningless. Human eyes see best under noon day sun illumination. That's when the cones are best activated. Noon sun is said to be 5000K. A standard tungsten light bulb is about 3200K. The monitor you are using to read this probably has its white balance adjusted to about 6500k, aka "bright white" (thank you, Sony). the lower the number, the warmer the color, higher colors go upwards to the blues and purples. Back 20 years ago, when people took pictures using film, photographers all had a good working knowledge of color temperature or people would end up looking like Martians. Don't believe me? Look up FL-D and FL-W (for color balancing under florescent light) or the 80 (80a, 80b, 80c) for balancing under tungsten light. Light toward dawn and dusk is more blue/purple so filtration to return to a 5000K optimum would be an 81 series filter. This is most important in bathrooms, dressing rooms and makeup rooms where women will be selecting cosmetics. What looks great at 5000k looks like stage makeup under 3400K tungsten light.

[@kelvinhoover6806]

Cool

[@catfishcave379]

All those science classes all those decades ago and you just mopped the floor with those old professors. This video should be used in classes.

[@JMjayesim]

2:10 roflmao

[@ironmatic1]

WHO IS KELVIN?

[@carultch]

Lord William Thompson Kelvin. He is known for determining the just how far below water's freezing point, the of absolute zero is (i.e. -273.15 degrees Celsius). He producing the first temperature scale based on setting zero at absolute zero. The Kelvin scale uses the same "size of the degrees" as Celsius. There is an analogous temperature scale, called the Rankine scale, which has the same "size of the degrees" as Fahrenheit.

[@kurbjunki]

Go easy on the intro....