I've seen a lot of Nichia's blue LEDs, in a number of shapes, sizes, and beam configurations. But this is the bluest one I've come across. This is their standard issue 15° 3000mcd blue model, but it comes from the bluest bin in the factory and also seems a tad brighter than their usual run.
Spectrum of this LED.
You see, when they make blue LEDs, they come out all kinds of funny shades of blue. Some greener, some bluer. These are sorted by how deep a blue color they emit and then placed in bins with other LEDs that have a similar color, so that when you need LEDs of a consistent color, that's what you get.
Bright, slightly irregular beam characteristic of this LED type.
Brightness is on par with Nichia's better (middle of rank "S") and they should easily be the brightest Nichia blue LED you are likely to come across in the near future. Figure these to be in the 3500 to 4000mcd range.
To the eye, these have a piercing, pure blue color that at times, can have a tendency to look ever so slightly violetish. They may also have a slightly "fuzzy" appearance from a distance, especially for those who wear corrective lenses. This is caused by the way blue light is focused differently than other, longer wavelengths. And when the blue is this intense, the fuzziness becomes more noticeable as you look toward the source. When a true violet LED finally becomes available, this effect will become much more intense.
When or if I ever get my hands on a true violet, I will discuss this visual phenomenon in more detail.
To keep you occupied in the meantime, try this experiment at home:
Get a bright red LED and a bright blue one (the deepest blue you can find). Connect the LEDs together in series (+ from one LED to the - of the other), add a 100 ohm resistor in series to the LEDs, and connect them to 6 volts DC, such as from 4 "AA" batteries in a cheap Radio Shack battery holder.
Set the LEDs up about a foot apart from one another and turn them on if they aren't already lit.
Darken the room lights, get about ten or twenty feet away and look at the LEDs. The blue one will look a lot larger than the red one and may have a "furry" appearance to it, yet they are both the same size.
WHITE 5500-6500K InGaN+phosphor
ULTRAVIOLET 370-390nm GaN
BLUE 430nm GaN+SiC
BLUE 450 and 473nm InGaN
BLUE Silicon Carbide
TURQUOISE 495-505nm InGaN
GREEN 525nm InGaN
YELLOW-GREEN 555-575mn GaAsP & related
True RGB Full Color LED
Spider (Pirrahna) LEDs
True violet (400-418nm) LEDs
Agilent Barracuda & Prometheus LEDs
Oddball & Miscellaneous LEDs
Programmable RGB LED modules / fixtures
Where to buy these LEDs
Links to other LED-related websites
The World's First Virtual LED Museum
The Punishment Zone - Where Flashlights Go to Die
Legal horse puckey, etc.
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