I stumbled over this “royal blue” when looking for colored Cree leds.
What’s the difference between “blue” and “royal blue”?
Which color is closer to US police blue lights?
blue=470nm
royal blue=450nm
dunno about your police
(Edit: corrected the above, should not have posted cause I have always mixed those up :person_facepalming: )
Strange, I always thought that it was the other way around.
Check out this chart that I clipped from the Luxeon Rebel Color datasheet.
datsheet here: https://www.lumileds.com/uploads/265/DS68-pdf
I have one of the Royal Blue emitters in a C8 and it will actually make some orange things fluoresce like crazy. All of the little orange stickers that fasttech puts on their baggies just pop and glow like crazy. Very interesting light colour.
Sorry about posting, you’re right, I mixed them up.
Thanks for the info.
Crees’ Product Characterisation Tool shows much higher lumen numbers for the Royal Blue LEDs compared to “standard” blue LEDs. Does anybody know why?
Btw: there is also XP-G3 in Royal Blue available.
Is this Royal Blue more harmful to human eyes, compared with “standard” blue?
I think Royal Blue is what Cree uses as the base light for their white LEDs. It’s definitely ’more harmful to human eyes, compared with “standard” blue’ but exactly how much harm it can cause, I don’t know. I think most cheap “UV” flashlights sold in stores are actually either Royal Blue or visible Violet because a lot of materials will fluoresce with those, but they are considered much safer than true UV light.
The Blue on the ledlenser P7QC is a 450nm “forensic blue”, and that is verging in the direction of purple/violet rather than blue!
Since I’m planning to modify a 4 LED light to multicolor I’ll probably use red, green, blue and royal blue LEDs (white is not required). It will be used by my children too so I like the idea to have something near to UV but not real UV.
Go look at all the cleaning fluids and other chemicals that’re under your sink (bleaches, disinfectants, cleaners, etc.). The labels and/or the contents will sometimes fluoresce all sorts of colors. 