How many Lumens from the current Supermoon?

Muto · 2019-03-20T23:58:31.000Z

Just wondering what the estimate is and what is the tint?
Last night it cast a very defined shadow and it made me wonder what the output realized is.

Also what is the output at the source?

Come on you nerds, sharpen those slide rule skills

deleted-200707 · 2019-03-21T00:17:33.000Z

I got out my grandpa’s slide rule butt I can’t get the screen to light up. Maybe the batteries are dead?

brad · 2019-03-21T00:22:22.000Z

Does this help?

jpl.nasa.gov

moonbrightness_worksheet.pdf

302.53 KB

zak.wilson · 2019-03-21T00:26:02.000Z

Output at the source is about 3.562*10^28 lumens, given that the source is the sun and the moon is just acting as a highly inefficient optic.

Lightbringer · 2019-03-21T00:46:00.000Z

Can’t really tell, as it seems to be stuck in moonlight mode.

nkresho · 2019-03-21T00:59:00.000Z

so, to be clear… we’re doing a moonbounce integrating “sphere” measuring the sun? Not an integrating bathroom, spare bedroom, lightbox, or integrating plumbing pipe…

TBH, Brad’s answer above seems overly serious , but precisely the actual answer.

Nev · 2019-03-21T01:11:24.000Z

About 15 & that’s official.

CREEXHP70LED · 2019-03-21T01:26:12.000Z

Just remember, if you are camping and it is cold, seek shade. Moonlight is cold, the shade is warmer.

Nothing is what it seem it is. I need to lay down now because the earth is spinning 1,000 MPH and at the same time the earth is orbiting the sun at 67,000 MPH. Also, to top it off the Sun, Earth and solar system are also in motion, orbiting the center of the milky way at 140 miles a second. Also…….Dizzy yet? Well hold on. The Milky Way itself is moving through the vastness of intergalactic space. Our galaxy belongs to a cluster of nearby galaxies, the Local Group, and together we are easing toward the center of our cluster at a leisurely 25 miles a second.

If all this isn’t enough to make you feel you deserve an intergalactic speeding ticket, consider that we, along with our cousins in the Local Group, are hurtling at a truly astonishing 375 miles a second toward the Virgo Cluster, an enormous collection of galaxies some 45 million light-years away.

I have heard some BS, but none finer that the crap NASA spews.

Sparks65 · 2019-03-21T01:29:47.000Z

If I’m camping and it’s cold, I put more wood on the fire; hope it doesn’t smoke up the dome.

CREEXHP70LED · 2019-03-21T01:32:41.000Z

Sparks65:

If I’m camping and it’s cold, I put more wood on the fire; hope it doesn’t smoke up the dome.

Yes, that just makes common sense, I do the same thing. LOL.

Tom_Tom · 2019-03-21T02:50:44.000Z

Albedo of the full moon is about 0.7. That’s a pretty efficient reflector, shining down sunlight on you at night.

Provided by Selene, the moon goddess.

You should be able to walk about with much less than that.

Go somewhere covered in snow, and it’s almost too bright.

I prefer moonless nights, and dark skies, so I can see the stars in their glory.

Let your eyes adapt and deliver what they can, you might be surprised how good they are, when not dazzled by unnecessary over-powered artificial light sources, or the city miasma.

Tom_Tom · 2019-03-21T03:12:16.000Z

FWIW, moon brightness can be up to 0.32 Lux. That’s lumens/m^2. Look over some landscape and estimate how many lumens a torch might need to cover that area, then realise why they can’t. Ever. Even if suspended from a drone.

In the limit a full moon can illuminate almost half a hemisphere. That’s an awful lot of lumens.

gchart · 2019-03-21T03:46:46.000Z

Tom Tom:

Provided by Selene, the moon goddess.

I knew it! ToyKeeper is a goddess!

jon_slider · 2019-03-21T03:48:18.000Z

my flashlight does not need to illuminate half a hemisphere
when Im sitting at a picnic table, I just need to see the plate of food, and the glass of wine, on the table in front of me.

How many lumens do I need from a light clipped to my hat, to match the brightness of the moonlight that lands on my wine and food?

Tom_Tom · 2019-03-21T04:19:04.000Z

I told you. Less than 0.32 lumens per m^2.

Which is probably about what a BLF torch does on “moonlight”, as tuned by TK. Coincidence ?

CREEXHP70LED · 2019-03-21T14:26:15.000Z

It all depends on the moon phase , Where you are on the flat earth and several other factors. Moonlight is different everyday. When I am in Florida and the sun is still fully visible, I can video chat my co-workers at DARPA, and they see the sun also over 9,000 miles away both at or near sea level. At 24,900 miles in circumference , we all laugh that anyone believe the earth is round, or I mean an oblate spheroid, or pear shaped. Get them while they are young walking into the classroom and they see the globe. You have officially endoctrinated them along with their ignorant parental re-enforcement.

DOC1500 · 2019-03-21T14:52:02.000Z

if your eyes are already adjusted to Moonlight projected from an extra large full moon when there’s a clear sky, and you turn on your flashlight to Moonlight mode,
Will you even see the light projected from your flashlight in Moonlight mode ?
I think they call that a wash.
Kind of like not being able to see the forest because the trees are in the way. LOL

Tom_Tom · 2019-03-21T15:00:12.000Z

Adhara:

Tom Tom:

Albedo of the full moon is about 0.7. That’s a pretty efficient reflector, shining down sunlight on you at night.

Huh? Where’d you get that. It’s much less, more along the lines of .13, and that includes opposition surge.

You are correct. At the time I was thinking about a very bright planet (Venus). Sorry for the error.

Although the moon has a rather low albedo, it is very close, very big, and very brightly illuminated by the sun.

It makes taking photos on the moon easy, it’s pretty close to an 18% grey card for setting exposure (or white balance, not that that was necessary for the film Hasselblads, back in the day).

For lunatics like me who enjoy photographing the moon from the earth, it can initially be surprising how short the exposures need to be, similar to normal daylight levels here.

My talk of “half a hemisphere” (doh!) was also incorrect.

Moonlight is so bright that one of our greatest scientific meeting of minds was scheduled every full moon, so they could travel on horseback to meet-up, by it’s light. https://www.lunarsociety.org.uk/orignal-lunar-men/

Now, back to to the OP’s question, “How many Lumens from the current Supermoon?” Would you like to come up with an estimate ? Thinking of having a go myself.

DOC1500 · 2019-03-21T15:05:12.000Z

Here’s something to factor into perceived light. Mydriasis.
Now that’s a problem!

Lightbringer · 2019-03-21T21:34:46.000Z

Had a look last night at the SuperMoon.

Odd, the “man in the moon” kinda looked like William Shatner.