Blue light is very, very bad.

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Enderman
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Lightbringer wrote:

Hmmm. I think you’re just a shill for the Blue Light Cartel… Shocked


I was referring to OP
DB Custom
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Kawi! Geesh man! You’re gonna give me nightmares!

Lightbringer
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Enderman wrote:
Lightbringer wrote:
Hmmm. I think you’re just a shill for the Blue Light Cartel… Shocked

I was referring to OP
That’s what the Blue Light Cartel wants everyone to think.

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freeme
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Haha, coated lens is fine but not this type. 

 

KawiBoy1428 wrote:
freeme wrote:

Avoid blue sunglasses/shades too. 

!{width:80%}https://tse1.mm.bing.net/th?id=OIP.IV5Cw1DrwchaxoiBLuSvGQHaDi&pid=15.1&P...! p. Hmmmm.....You might be onto something there freeme... :D

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eas
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Enderman wrote:
I think someone is reading too far into a scientific article and becoming a bit paranoid…

Scientific Article? It looks more like a press release to me, probably from the university’s PR office.

.

Phlogiston
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eas wrote:
Enderman wrote:
I think someone is reading too far into a scientific article and becoming a bit paranoid…
Scientific Article? It looks more like a press release to me, probably from the university’s PR office.

Although the Phys.org article almost certainly was derived from something written by a PR person, there is a real scientific paper behind it:

http://dx.doi.org/10.1038/s41598-018-28254-8

When I looked at the paper, I rapidly found out why the PR person actually did perform a useful role in this case Smile

Enderman
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eas wrote:

Scientific Article? It looks more like a press release to me, probably from the university’s PR office.

Press release based on a published scientific article.
spinynorman
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This is what happens when your big, fat government grant to push man made global cooling/warming/change dries up and you still have to pay off the Range Rover.

iamlucky13
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Paraclesus was on the right track on this topic as with so many others when he argued, “Sola dosis facit venenum.”

The actual paper is about in vitro testing (eg – in a petri dish) that appears to be aimed at determining the chemical and biological processes by which blue light contributes age related macular degeneration.

Although well outside my expertise, it appears to be good research into the fundamentals of how the eye functions and why blue light exposure is correlated with long term adverse effects.

However, it does not examine what level of risk is correlated to given exposure levels, so it is a misrepresentation of this research to present it as an argument for avoiding all blue light exposure.

chinooker
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Well, I have had a couple of Blue Light Photodynamic Therapy for pre-cancerous lesions.
One on my face 2wks ago and yesterday on both forearms.

I’ve had innumerable burn-offs using liquid nitrogen to get rid of barnacles on my hands and face/neck. I worked in the field most of my life in sunny So-Cal and had a three wheel M-Cycle with which we toured pre-helmet laws. Fishing was the primary choice for vacation venues. Lots of sun…not so much sunscreen. I quit smoking in time to dodge that bullet, butt now I’m fighting this contender for my mortality.

The first facial treatment was like getting a suntan….sorta. Wiped my face with acetone,(now that is some serious oil remover), then she shook up a vial of $735 lotion that she applied all over my mug. Wait one hour, then activate the magic elixir with the blue light 3/4 enclosure around my head which attacks any cancerous/pre-cancerous lesions. I’ve had better days on the beach, butt it was only mildly prickly/itchy/burning.

The arm session was a bit more intense. She wiped the elixir from two vials on my forearms and I waited 2hrs this time. When she started the 15 min 40 sec treatment I knew this one was different. I truly expected my hands/arms to look like lobster claws. I endured the burn only by twitching/shaking and not wimping out with my wife right there. Displaying a bit of sun-poisoning, one forearm is like Popeye, the other like Olive Oyl.

The second day is much better. Not hurting at all, just some itch. I would definitely advise this over the ointment which produces lesions which take weeks sometime to heal. More like a bad sunburn. Just one more treatment on my face and one on my arms.

Anyway blue light is not all bad!

Lightbringer
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So whut’s in the pricey magic lotion? 5-FU?

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Gary Vicker
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Always get annoyed by the contradictory articles.
See this- https://www.aao.org/eye-health/news/smartphone-blue-light-is-not-blindin...

Whom to believe? Sick Angry

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Good luck chinooker with the treatment, that does not sound like a lot of fun, but I hope it works!

chinooker
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More info from American Cancer Society on treatment of actinic keratosis which are considered pre-cancerous lesions.
https://www.cancer.org/treatment/treatments-and-side-effects/treatment-t...

My arms/hands are pretty much healed of the treatment and already look much improved with fresher looking skin and way fewer bumps and barnacles. My 2nd & last facial was last week and has peeled like my worst sunburn. My 2nd & last arm treatment is scheduled on the 24th. I recommend this over the Chemotherapy or Cryosurgery which can miss quite a few of the small ones which then show up later. This covers the whole area that the liquid is applied.

They say no exposure to sunlight for a few days. I knew better and I had my hat on and I just needed to run the riding mower up to the new shed our contractor is building so he could adjust the ramp for proper clearance for the cutting deck. Wow, I paid dearly for just a few minutes off side exposure to the early morning sunlight. Pay attention to their instructions!

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I find it quite amusing to see people using his smartphone screens with “night modes” activated, makes screens look like CRAP. Big Smile

A slight screen temperature correction can be beneficial for those willing and able to do it. Related information: http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/

 

KawiBoy1428 wrote:
These Blue Lights are Worse, avoid please Big Smile

LMAO! 

Cheers Smile 

Innocent

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Werner wrote:
I have no pets so I have too pee on the carpet myself…

“this tiny flashlight was the one that shined best”
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Blue light wakes you up. Without it we would aways be somewhat tired.

1stein
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I hope for a little continuation within the thread of blue light. I see no reason to open new one though, so allow me to blend into this one.

I got really interested in blue light contribution since I’ve learnt it has more meaning than I first thought.
Just summing up what I’ve learnt so far:
- blue light is the factor that attracts insects. Its lack makes a light neutral for insects (and probably also some other living forms)
- blue light is unhealthy for human: lower melatonine surpression, may favor cancer, may damage eyes
- not sure about its night vision preservance capability

So my first thought was to search for light without content of blue wavelenghts which turned out not to be so easy. So far I’m falling in love with the red light (mainly for above mentioned reasons) since I know it has many advantages. But there are also some other choices. Wiser than me say a warm light contains quite a little of blue but even 2000K contains some. And here’s the question: which white LED would have least blue? What factors decide of amount blue emmited? I think besides the color temperature a tint should have a meaning too?

I’d really like to know if good pretenders (like E21A 2000K, XP-E2 red 620/660, XP-E2 amber, XP-E2 green, XP-L 3000K, SST-20 2700K etc.) are in fact so “blueless” as one might thought.

At least I have two good reasons to search for such led: 1. Insects, 2. good health
Will you contribute your knowledge? Please.

PS: some other posts on blue light:
jon_slider
MontyPyfon
brad
1stein

The_Driver
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1stein wrote:
- blue light is unhealthy for human: "lower melatonine surpression"

Only at night!!!

It is absolutely essential during the day. Sunlight has a high blue content. It is the natural light source that humens are adapted to. It makes you more awake during the day.

 

If you want good lighting at home, just make it as natural as possible (=> similar to the sun). Bright cool-white light during the day and dimmer, warm light in the evening.

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All “white” light will have some blue. The lower the CCT, the less blue it will contain. You’d need to check the datasheet for any particular emitter for its emission frequency range and compare to the frequencies that you consider “blue” to see how much blue spectrum light it emits.

Any monochromatic LED that isn’t blue should contain no blue spectrum light, except for maybe some “green” emitters, such as Cyan. Again, you should be able to check the datasheet to see if it has any blue spectrum light emission. Monochromatic emitters of red, orange, amber, and some greens should be completely blue-light free.

There have been conversations on here and elsewhere about blue-light free nighttime lighting. IIRC, the recommendation is to use just red, orange, and amber lights at night. This works whether you’re talking about human melatonin production or just trying not to attract bugs. But, for most of us, simply using “less” blue light seems to be enough.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

1stein
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The_Driver wrote:

Only at night!!!


It is absolutely essential during the day. Sunlight has a high blue content. It is the natural light source that humens are adapted to. It makes you more awake during the day.


 

This is the bottom – I use flashlights only when it’s dark, mostly when walking the dog just before going sleep. Usually 60-90 minutes.

jon_slider
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Gary Vicker wrote:
Always get annoyed by the contradictory articles.
See this- https://www.aao.org/eye-health/news/smartphone-blue-light-is-not-blindin...

Whom to believe? Sick Angry

that is not contradictory, it is about damage to the retina, which is not the topic of this thread

blue light interferes with sleep, by suppressing the hormone that supports sleep, melatonin

blue light is not bad during the day, when we need to be awake, and alert

iamlucky13
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1stein wrote:
The_Driver wrote:

Only at night!!!


It is absolutely essential during the day. Sunlight has a high blue content. It is the natural light source that humens are adapted to. It makes you more awake during the day.


 

This is the bottom – I use flashlights only when it’s dark, mostly when walking the dog just before going sleep. Usually 60-90 minutes.

The intensity is important, too. One of the main studies I’ve found on the effects of light of different CCT’s (where higher CCT’s have more blue present) on melatonin suppression was conducted in a room lit to 200 lux.

That’s not necessarily easy to compare to a flashlight beam where the illumination around you will be uneven, but I think it’s safe to say we’re talking about several hundred lumens of illumination up close, and significantly more further away to cause equivalent melatonin suppression to cause comparable levels of suppression.

Of course, other studies have looked at intensity specifically as a variable, and melatonin suppression continues down to much lower levels, although this study saw on 2% melatonin suppression at 22 lux for 1 hour from ~2700K light.
https://www.researchgate.net/publication/315646147_A_Working_Threshold_f...

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Who knew those KMart ‘blue light specials’ were so hazardous?

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