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/sci/ - Science & Math

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9370090 No.9370090 [Reply] [Original]

How is looking at the sun without eye protection worse than looking at a 300 watt lightbulb a few metres away?

>> No.9370095

>>9370090
Its the same really.

You could do the math and figure out how close an x watt lightbulb needs to be to your eye to do the same damage.

>> No.9370100
File: 37 KB, 920x480, led-lighting-2.jpg [View same] [iqdb] [saucenao] [google]
9370100

>>9370090
It's all about the spectrum. The sun has a higher intensity at wavelengths that would harm your eyes than an incandescent bulb.

>>9370095
No not really, more energetic wavelengths harm your eyes more than lower energetic wavelengths.

>> No.9370108

>>9370100
semantics.

You could isolate those wavelengths and it wouldn't change your equations much.

Go ahead and stare directly into a 100 watt bulb from 1 cm and see how it feels if you don't believe me.

>> No.9370114

>>9370100
Also your graph clearly doesn't take into account the 1/x^2 relationship, or source power.

very simplistic and misleading.

>> No.9370117
File: 58 KB, 780x438, 170821151707-donald-trump-eclipse-exlarge-169.jpg [View same] [iqdb] [saucenao] [google]
9370117

>>9370090
Sunlight carries UV, which you can't see.
Too much visible light is painful and you turn away.
UV damages your retina without causing you to flinch.

Only a fuckin' idiot stares at the sun.

>> No.9370123
File: 25 KB, 692x431, led.png [View same] [iqdb] [saucenao] [google]
9370123

>>9370100
A quick image search of led spectrum gives useful information, and suggests that your graphs may have even been doctored.

>> No.9370143

>>9370100
This is the kind of "engineer" society wants...

>> No.9370152

>>9370123
how's his led graph any different from yours?

>> No.9370154
File: 252 KB, 2048x2048, stare.jpg [View same] [iqdb] [saucenao] [google]
9370154

>>9370117

>> No.9370160

>>9370108
>>9370114
>>9370123
>>9370143
Now this is the power of autism.

>>9370152
I'm guessing it's just a different brand of LED.

>> No.9370166

>>9370160
>I'm guessing it's just a different brand of LED.
No I mean just look at them where's the difference? They look exactly the same

>> No.9370173

>>9370166
The intensity of the peak around 460nm has a higher intensity on the first image relative to the 550nm band in the first image. It could also have to do with how the spectrometer was calibrated.

>> No.9370177

>>9370154
To be clear, "stares at the Sun" without eye protection.
Also, to be clear, "fuckin' idiot" wasn't a metaphor.

>> No.9370199

>>9370166
tails do not fall to zero.

>> No.9371108

THIS THREAD HAS BEEN CLAIMED IN THE NAME OF SWIR

SHORT WAVE INFRARED POSTS ONLY

[spoiler] NIR will be tolerated too but not that fucker Red

>> No.9371117

>>9370090
You're eyeballs work like your ears, perceived intensity is logarithmic. So bright lights are fucking way brighter than your eyes perceive. So the Sun is like way brighter than it looks.

>> No.9371222

As the other guy said, it has more to do with wavelengths than intensity. The people who don't get this or deny it are retarded. Stand naked in a room brightly lit with incandescent bulbs for as long as you want. You won't get a sunburn. Then go outside and stand naked in the sun around noon for a few hours. After you get back from the burn treatment center, report your findings.

>> No.9371227

>>9371222
LMAO

>> No.9371234

Sun puts out 1300 watts per square meter on to the earth surface

>> No.9371908

>>9370090
>How is looking at the sun without eye protection worse than looking at a 300 watt lightbulb a few metres away?

The sun is super bright, and staring at it for too long can cause blindness.

The whole thing about "Don't stare into the eclipse" is because the corona of the sun is ALSO super bright, and staring at the shadowed portion (the moon) tricks you into thinking that it's safe.... so you stare for longer than you ordinarily would if it was just the un-obscured sun.

THAT'S why they tell you not to stare into the eclipse...

>> No.9371931

>Highly energetic nuclear reactions that produce photons of all sorts of wavelengths, many of which still go through the atmosphere
>a lightbulb that generates photons through simple electric excitation

Wait, you guys aren't being serious right? Does nobody know anything about biology here, much less chemistry or physics? If what the anon claiming that LED is basically the same as the sun is true, then why does it not produce free radical oxygen species and ozone, except in much higher intensity than any typical commercial LED is going to be?