Dangerous wavelength?

So during the process of hot de-doming an XML2 emitter a very small corner of phosphor came off. I would say somewhere around the size of a grain of sand, or around .005”. After final assembly of the light, I noticed a very small amount of the blueish/purple color (that appears when phosphor is removed from an LED) appeared in the outer edge of the spill light. I only noticed this when shining at a wall. Most people would never see this, and the light works well. I mod, and sell these lights to local folks, and don’t want to hurt anyone’s vision.
Question; Is the wavelength of light produced in this condition dangerous?

Nope, danger would start below UV-C.
UV-A and B can also damage tissue over a long time, but white LEDs are always in the blue part of the spectrum, so you’re good.

Great! Thanks for the good info.

Xml uses normal blue LED

At same brightness is daylight >100 times more deangerous as it contains deep blue and UV

I think if there was any question of dangerous radiation from a flashlight LED, you wouldn’t be able to escape the warnings about not tampering with the LED and not operating it in a damaged state. I’ve never seen any.

Years ago when halogen desk lamps first came out there was a sticker on them saying not to use them without the glass cover in place because of the UV they produced, which I’d guess was quite small.

Short arc lamps are a lot more dangerous than LEDs for emjitting UV light.

when you “go blue” by hot dedoming (or ripping it off physically works??) my question is… whats the output like lumens wise as compared to before.

fifure it cant be more, hoped it was similar, but, i realize it might ruin efficiency and go WAY down, figured i’d ask…

i got interested in this, after seeing the thread with the picture of the PRETTY blue “de-everythng” nichia.

figured i could try it with a cheap CREE or maybe a lettuce-brite, just to see what it does, for the novelty.

Technically it can, because lumens are measured based on what the human eye can see, and white light appears much brighter than blue.
10W of blue is far less bright than 10W of green, and therefore even though it’s the exact same power the lumens will be higher for green.

Mark Twain cautioned about being careful reading medical books, because you could die of a typographical error.

You’ll find plenty if you search “blue light hazard”
Note carefully what the source is for comments. Much of what’s there is commercial speech favoring some particular product or denying the published science about risk. The LED industry is actively pushing back against the health info because the blue-white LEDs are the cheapest to make and most profitable. One researcher I’ve swapped email with said that LED industry people have been attending scientific meetings to try to defuse this issue, particularly in Europe where there’s more attention being given to protecting public health.

This is, from everything I’ve read, a decent summary:
> dangerous wavelength?

465-495nm.
That’s a link to a search. Remember, you can look this stuff up.

Here’s a decent summary, from that result, if you want the chemistry:

There are two very different issues. One is sleep and body clock regulation, e.g.:

The other issue is damage to the retina, which is cumulative over time and becomes obvious in older people, e.g.:

If you get regular eye exams, you’ve probably noticed that your eye doctor is no longer using the bright blue-white light to inspect the retina when your eyes are dilated — they’re now using a yellow-white (filtered) light source.

People will tell you that LEDs aren’t as bright in this band as sunlight.
But remember, LEDs are point sources and the energy focused on the retina is much higher than the energy from diffuse daylight.

It’s a longterm, cumulative risk that adds up over time. Look at the incidence of macular blindness.