I collect 5mm T1 3/4 LEDs of varied wavelengths and I need to find a blue LED around 460nm (wherever it wont look cyanish or violetish) with reasonable high brightness (1000 mcd) and purity (25nm spectral half width). I got these Forge Europa LEDs from farnell recently:
1) U500B06WCSL
2) U501B06WCSL
3) U500B06CDSL
#1 has the highest flux and the narrowest beam (what I ideally want) but is too violetish. #2 produces a beam that spreads out more and so is dimmer but has the advantage of being somewhat noticably bluer with a longer dominant wavelength than #1. #3 is the diffuse equivalent of the first two but it really stands out as having the blue I want when I feed it a lower current such that its only as bright as ordinary diffuse LEDs. Theyre all on the same datasheet as having 458nm peak and 460nm dominant wavelengths but I can easily see the differences.
So what I want is the beam shape intensity of #1 but with the colour of #3. The first two types are in a water clear package while #3 has a smokey slightly bluish grey lens but the metal parts inside the plastic of #1 and #3 appear to have the same design different from #2 (perhaps #1 and #3 have a die that #2 doesnt?).
I was thinking of ordering multiples of type #1 because blue LEDs apparently vary in wavelengths. Should I do this to maybe get #3's colour or could it be the package colour of #3 that gives it the unique blue?
1) U500B06WCSL
2) U501B06WCSL
3) U500B06CDSL
#1 has the highest flux and the narrowest beam (what I ideally want) but is too violetish. #2 produces a beam that spreads out more and so is dimmer but has the advantage of being somewhat noticably bluer with a longer dominant wavelength than #1. #3 is the diffuse equivalent of the first two but it really stands out as having the blue I want when I feed it a lower current such that its only as bright as ordinary diffuse LEDs. Theyre all on the same datasheet as having 458nm peak and 460nm dominant wavelengths but I can easily see the differences.
So what I want is the beam shape intensity of #1 but with the colour of #3. The first two types are in a water clear package while #3 has a smokey slightly bluish grey lens but the metal parts inside the plastic of #1 and #3 appear to have the same design different from #2 (perhaps #1 and #3 have a die that #2 doesnt?).
I was thinking of ordering multiples of type #1 because blue LEDs apparently vary in wavelengths. Should I do this to maybe get #3's colour or could it be the package colour of #3 that gives it the unique blue?
