Is brightness of light harmful

nanoWatt · Dec 21, 2007

I asked this in one of the threads but it wasn't responded to, so I figured I'd start a new thread.

I'm just wondering. I have a Fenix T1 and I was outside with it set on Hi at night. I pointed it toward my back yard, from about 30 feet away, and I could see my dog in the light.

Will the T1 cause any damage to my dog's eyes from that far away. I'd say I shone it for a couple seconds to get a decent look.

Valolammas · Dec 21, 2007

Well, dogs' eyes are different from humans' eyes, but I'd be very surprised if you had caused any damage. It's not really all that bright compared to sunlight and LED light has a very low UV content. It's still not a good idea to stare at them or point them at any creature's eyes for prolonged periods, but a couple of seconds from that distance very probably didn't do any harm.

scottaw · Dec 21, 2007

I'd say from that far away, no. If it were hurting his eyes at all i'm sure he would have just turned away.

chiphead · Dec 23, 2007

I always thought there was a lot of UV coming of those LEDs. I'll find out with my up coming eye test, not from my light but for being type-2 diabetic.

chiphead

yellow · Dec 23, 2007

another stupid "eye damage from flashlight"-tread

(think of a zillion really powerful car hedlights You, the dog, the child, anyone else has been passed by for years,
and let alone staring into the brightest light souce avaliable (except for a laser) --> the sun
- any got blind?
thats what mother nature gave us the blinking REFLEX for. Can only be tricked by a laser)

SilverFox · Dec 23, 2007

Hello Yellow,

While I agree that this question comes up from time to time, I still maintain that the only "stupid" question is the question that is not asked...

Tom

joema · Dec 23, 2007

It's not a stupid question. Lots of good info in this thread, including posts from an ophthalmologist:
http://candlepowerforums.com/vb/showthread.php?t=109755

jirik_cz · Dec 23, 2007

chiphead said:
I always thought there was a lot of UV coming of those LEDs. I'll find out with my up coming eye test, not from my light but for being type-2 diabetic.

chiphead

None UV light comes from white light LEDs. Maybe you are confusing LED with HID

stonehold · Dec 24, 2007

I use a low output light while walking my dog just to be safe. That 4-8 feet of leash is a little too short for long term nightly exposure to lots of lumens. We do a lot of walking where it's nice and dark so big light isn't necessary for him. And I always have another light or two or four if I need more just for me. If I'm over cautious with my pup....good. He's worth it.

chiphead · Dec 24, 2007

jirik_cz said:
None UV light comes from white light LEDs. Maybe you are confusing LED with HID

You might have a point there.

chiphead

Is brightness of light harmful

nanoWatt

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Valolammas

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scottaw

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chiphead

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yellow

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SilverFox

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joema

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jirik_cz

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stonehold

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chiphead

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