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Old 12-19-2010, 04:19 PM #17
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Default Re: Blue lasers can cause cancer?

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Originally Posted by FrothyChimp View Post
The solution lies in the definitions of ionizing versus non-ionizing radiation. Your concern with a 405nm should lie in thermal damage. Thermal damage does not cause cancer as the amount of heat required to damage the DNA in the nucleus has long since denatured the proteins outside of the nucleus resulting in cell death.


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Old 12-19-2010, 04:27 PM #18
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Default Re: Blue lasers can cause cancer?

FrothyChimp has good reputation, but this doesn't convince me, to me it just sounds like a theory and not a proven fact.
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Old 12-19-2010, 08:10 PM #19
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Default Re: Blue lasers can cause cancer?

Everything causes cancer, so just assume that they do cause cancer and protect yourself.
It has been proven that scientists cause cancer in laboratory rats.
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Old 12-19-2010, 09:13 PM #20
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Default Re: Blue lasers can cause cancer?

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Remember this is 1 Watt of blue light in a few square mm of area.
Remember, this is a class 4 laser. Avoid eye and skin contact.
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Old 12-19-2010, 09:18 PM #21
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Default Re: Blue lasers can cause cancer?

He wasnt stupid, he went through medical school.

Don't go calling people dumb if you dont know them. It shows immaturity.

He said it CAN.
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Old 12-19-2010, 10:05 PM #22
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Default Re: Blue lasers can cause cancer?

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Remember, this is a class 4 laser. Avoid eye and skin contact.
The question was if it causes cancer *if* it hits the skin. I don't need anyone to tell me not to point a laser in my eye or skin on purpose.
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Old 12-20-2010, 05:53 AM #23
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Default Re: Blue lasers can cause cancer?

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He wasnt stupid, he went through medical school.

Don't go calling people dumb if you dont know them. It shows immaturity.

He said it CAN.
*shrug* simply making it through medical school is not proof of intelligence sadly enough. I've myself had a doctor that I seriously wondered if the only thing he got on his I.Q. tests, was drool. (long story there)

However, a more logical assumption is this: Every day it seems like more and more things are found to be hazardous to your health. Also given the ease at which doctors can get sued for malpractice, it makes sense that a doctor might, just might, err on the side of extreme caution when telling what causes cancer.

I personally find it hard to believe that the cancer causing range extends to 500nm. That's quite close to human visual sensitivity peak... and since this doctor said 400-500nm. not <500nm that would be implying that 400nm is dangerous, but 350nm is not? *shrug* any way you look at it. it just doesn't make sense from a logical perspective.

Meh, err on the side of caution. Shining high powered lasers at your skin is probably not the brightest thing to do. (regardless of just how "bright" of an idea it is)
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Old 12-20-2010, 10:15 AM #24
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Default Re: Blue lasers can cause cancer?

I told him It was a 445nm laser that I built. and Verbatim If you want "The 400 -500nm range has been shown to increase the number of cancer causing cells."
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Old 12-20-2010, 04:33 PM #25
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Default Re: Blue lasers can cause cancer?

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He wasnt stupid, he went through medical school.
Not to say he isn't intelligent or possibly knows what he is talking about, but I have met some pretty ignorant and arrogant people who established their apparently infinite and all-knowing knowledge over videos and encoding on merely taking and passing a [heavy?] course in college.. and clearly had no idea what they were talking about when they proposed to me that renaming my video to *.avi "because AVI always works" would fix the chuggy rendering of the video and lack of synchronization between video and audio, and showed absolutely no understanding of containers, codecs, encoders, file extensions, file formats, HEX, etcetera when it was really due to the fact that my poor low-end laptop with Intel graphics didn't have the horsepower to output such complicated display to over 50' of unamplified VGA to two projectors.

Long story short, I was foolish and stupid to try argue back and defend my position. I forgot about the rule of arguing with a group of noobs..

I still don't know if 445nm @ 1W can cause cancer. Perhaps nobody really knows because there isn't any scientific evidence to actually prove it? Nevertheless, it isn't like I am going to go ahead and start touching it and stuff (and yes, I know about how easy it would be to burn self).. I would rather be on the safe side of the fence on this one, just in case I would be wrong otherwise.

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Old 12-21-2010, 02:49 AM #26
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Default Re: Blue lasers can cause cancer?

Of all the things out there that can cause cancer, this would be pretty low on my list of worries. Also of all the dangers posed by such a powerful laser, cancer is not one I would spend much time worrying about.

These lasers have the potential to be *extremely* dangerous, but not because of cancer.
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Old 12-24-2010, 03:32 PM #27
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Default Re: Blue lasers can cause cancer?

everything does cancer these days...
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Old 12-25-2010, 01:16 AM #28
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Default Re: Blue lasers can cause cancer?

WAtch out, peeps in this thread -rep you for posting the results of asking a skin doctor.
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Old 12-26-2010, 10:42 AM #29
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Default Re: Blue lasers can cause cancer?

oh just bugger off toaster, seriously
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Old 12-26-2010, 12:44 PM #30
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Default Re: Blue lasers can cause cancer?

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Also... what self-respecting male has a dermatologist?
All of us self-respecting males do.
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Old 01-02-2017, 04:39 PM #31
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Default Re: Blue lasers can cause cancer?

Instacancer for supernatural vermin. Not as good as silver but in a pinch.
For human the effects scale with stupidity at a 1:1. Don't try to tan with it. Don't "check your eye" with it. Don't hand it to someone else. Wear eye protection when necessary. The whys and how's are mentioned in this thread you have resurrected.
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Old 01-03-2017, 12:45 AM #32
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Default Re: Blue lasers can cause cancer?

They key thing to look for is if burns from 445 nm lasers cause more cancer than similar burns from other sources (like touching a soldering iron or getting a speck of glowing hot charcoal on your hand).

If you sustain trauma like getting burned, cut or something like that, your body will have to repair the damage somehow. For damage larger than a tiny prick this will often result in scars (not always visible to the naked eye).

The thing with scar tissue is that it's rapidly dividing cells, attempting to fill a gap left by a laceration or something similar. This process has to be fast to recover at a reasonable rate, but it's also imperfect, which is why we get scars in the first place (if it healed perfectly by our genome-book, there would be no scars).

I suppose that with any rapid-healing of scars regardless of cause there -could- be some increase in cancer risk (like basal cell carcinoma).

So, as a precaution, i'd say:

- don't burn yourself wilt lasers of any color
- don't jump into campfires
- don't juggle chainsaws

The latter two have a bit higher risk of killing you before cancer does, but if you survive you might still be at increased risk
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