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You are using an out of date browser. It may not display this or other websites correctly.You should upgrade or use an alternative browser. How Many Lumens Does the Sun Produce

• Thread starter Thread starter Ginseng
• Start date Start date May 31, 2003

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Ginseng

Flashlight Enthusiast

Joined Feb 27, 2003 Messages 3,734 Just wondering...exactly how bright IS the sun? I mean compared to an ARC LS or Megaclops. Wilkey

desmondpun

Newly Enlightened

Joined May 4, 2003 Messages 197 Location Australia http://library.thinkquest.org/J002809/sun4.html 380000000000000000000000000 Watt

PhotonBoy

Flashlight Enthusiast

Joined Mar 11, 2003 Messages 3,304 Location Annapolis Valley, Nova Scotia, Canada http://tinyu ... or about 130 watts per square foot

PaulW

Flashlight Enthusiast

Joined Mar 23, 2003 Messages 2,060 Location Laurel, Maryland . . . at a distance of 93 million miles F

Floating Spots

Enlightened

Joined Aug 7, 2002 Messages 667 Location Elkhart, IN The 1 Watt LS is ~18 lumens per watt, so 6840000000000000000000000000 lumens.... If you can put something equivalent in a portable flashlight, I'll give you a dollar. Of course, the battery runtimes would be horrible. /ubbthreads/images/graemlins/twak.gif G

Ginseng

Flashlight Enthusiast

Joined Feb 27, 2003 Messages 3,734 Hehe, I thought the answer would be something incredible. That's a lot of photons! Wilkey

PhotonBoy

Flashlight Enthusiast

Joined Mar 11, 2003 Messages 3,304 Location Annapolis Valley, Nova Scotia, Canada http://tinyu Re: How Many Lumens Does the Sun Produce? Want bright? Try a hypernova. http://www.physics.lsa.umich.edu/nea/news/articles/April03/upi.htm "During the first minute after the explosion it emitted energy at a rate more than a million times the combined output of all the stars in the Milky Way... If you concentrated all the energy that the sun will put out over its entire 9-billion-year life into a tenth of a second, then you would have some idea of the brightness," Ashley said."

Rothrandir

Flashaholic

Joined Aug 17, 2002 Messages 7,795 Location US Re: How Many Lumens Does the Sun Produce? wow! better have good sunglasses when you look into that! /ubbthreads/images/graemlins/eek.gif

PaulW

Flashlight Enthusiast

Joined Mar 23, 2003 Messages 2,060 Location Laurel, Maryland Re: How Many Lumens Does the Sun Produce? Always wear sunglasses. /ubbthreads/images/graemlins/cool.gif /ubbthreads/images/graemlins/smile.gif B

BuddTX

Flashlight Enthusiast

Joined Nov 27, 2001 Messages 2,521 Location Houston, TX Re: How Many Lumens Does the Sun Produce? Yea, but just look at how YELLOW the SUN is! I will wait for the LED version to come out, now THAT will be bright!

shiftd

Flashlight Enthusiast

Joined Nov 17, 2002 Messages 2,261 Location CA Re: How Many Lumens Does the Sun Produce? NOOOO I like the sun "warm." Who want to be "cool" anyway /ubbthreads/images/graemlins/grin.gif A more serious, yet unrelated and out of question argument: If the sun came from led, where the heatsinking goes? The sun were like a big bulb that heat transfer made via radiating the heat to us. If it were from led, we gonna be "bye bye"

Rothrandir

Flashaholic

Joined Aug 17, 2002 Messages 7,795 Location US Re: How Many Lumens Does the Sun Produce? would the vacuum of space suck the heat out? it's pretty cold out there as it is...but that's a lot of heat when you overdrive a 5w luxeon to be as bright as the sun /ubbthreads/images/graemlins/icon15.gif H

highlandsun

Enlightened

Joined Aug 11, 2002 Messages 607 Location Los Angeles, CA Re: How Many Lumens Does the Sun Produce? vacuum is an insulator.... heat transfer would have to be through physical matter being ejected, carrying some heat with it.

Empath

Flashaholic

Joined Nov 11, 2001 Messages 8,508 Location Oregon Re: How Many Lumens Does the Sun Produce? Heat is transfered by conduction, convection or radiation. Conduction is the propogation of energy through a material medium, of which is in very limited amounts from the sun to the earth. Convection is the actual mixing of the heated materials with other materials, like a virtual mixing bowl. Again, and thankfully, we don't share that material with the sun. Radiation is the propogation of energy through a particles or waves. With the sun, we receive electromagnetic waves, which results in heat and other forms or released energy as the those waves, such as light, react with everything that absorbs them.

Mednanu

Enlightened

Joined Feb 16, 2003 Messages 333 Location Earth... Re: How Many Lumens Does the Sun Produce? What BIN code is the SUN from ? I'm not going to buy one unless I can get a good BIN code ! I'm sick of all these pea green suns with high Vf's.......(chuckle)

Daekar

Enlightened

Joined Mar 23, 2007 Messages 837 Location Virginia, USA LOL I love this forum! I was going to ask this specific question and decided to google it first.... what's the first hit when you type in "How many lumens is the sun?" Yep, right here. N

nerdgineer

Flashlight Enthusiast

Joined May 7, 2004 Messages 2,778 Location Southern California Re: How Many Lumens Does the Sun Produce?

BuddTX said: Yea, but just look at how YELLOW the SUN is... Click to expand...

It's yellow in the pictures they paint for books, or when it's low in the sky, but sunlight's actual color temperature is about 5800 degrees K, an almost perfect white. I thank that's because we evoloved under it, so our eyes are optimized to see it as a perfect white... J

JanCPF

Enlightened

Joined Oct 17, 2003 Messages 846 Location Denmark Re: How Many Lumens Does the Sun Produce?

nerdgineer said: It's yellow in the pictures they paint for books, or when it's low in the sky, but sunlight's actual color temperature is about 5800 degrees K, an almost perfect white. I thank that's because we evoloved under it, so our eyes are optimized to see it as a perfect white... Click to expand...

Precisely! - Right on. It's funny how most people think the light from the sun is yellow, and then you shine an incan light and an LED light onto a piece white paper in full sunshine showing how the LED is colorless and the incan is yellow. The reason the sun "looks" yellow is probably because of the blue sky that surrounds it. Human eye "white balance control" at the works here. Jan Last edited: Apr 14, 2007

2xTrinity

Flashlight Enthusiast

Joined Dec 10, 2006 Messages 2,386 Location California

The 1 Watt LS is ~18 lumens per watt, so 6840000000000000000000000000 lumens.... If you can put something equivalent in a portable flashlight, I'll give you a dollar. Click to expand...

The spectral output of the sun is closer to 100 lumens per watt -- most blackbody radiators that we are used to (incandescent lamps, for example) operate at a fairly low temperature, so the "peak" wavelength is usually in the infrared -- this means that only a small fraction of the energy is released as visible light, usually with an efficiacy of around 10-25 lumens per watt for incandescent. In the case of the sun though, its surface temperature is about 5700K, which means that the "peak" wavelength is actually in the green portion of the spectrum -- which coincides with the eye's sensitivity peak. If a filament material existed that would operate at 5700k, we could have incan lamps with 100 lm/W efficicacy, and perfect color rendering. (don't count on it -- tungtsen is already the metal with the highest melting point, around 3400k, and running it near that point results in very very short life).

Precisely! - Right on. It's funny how most people think the light from the sun is yellow, and then you shine an incan light and an LED light onto a piece white paper in full sunshine showing how the LED is colorless and the incan is yellow. The reason the sun "looks" yellow is probably because of the blue sky that surrounds it. Human eye "white balance control" at the works here. Click to expand...

Yep, most people consider the sun to be "yellow" and the moon to be more "blue", when in fact that moon is a poor reflector of blue light, so its apparent color temperature is actually lower (more yellow) at about 4000k. I suppose it does look bluish though compared to the typical high pressure sodium lamps (1900K) most people have to compare it to...

Want bright? Try a hypernova. Click to expand...

A hypernova is going to emit all of its energy as high intensity gamma rays, so considering it "bright" is somewhat of a misnomer -- the only way we've been able to "see" them is that the gamma rays sometimes hit something else, which in turn re-emits light in the visible range. I

IMSabbel

Enlightened

Joined Dec 4, 2004 Messages 921 Nah, the hypernove will emit most of the energy as neutrinos (just like normal novas), so we will never see it...

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