LED 425nm

Go check out www.superbrightleds.com for a wide variety of LED stuff.

Prices are affordable and they ship overseas, too.

Good luck with your project!

Look for Blue LEDs in the market. They are everywhere.

i usually buy mine from here.

they have access to many manufacturers, and you can download their current catalogue in PDF form.

Cree, Lumileds, Osram, etc. You are looking for a GaN device or SiC device. What is the lumins per watt you need?

HI GUYS THANX A LOT FOR REPLYING .......... I'M REALY HAPPY TO SEE THE RESPONSE ........ AND ABOUT THE LUMINESCENCE ....... I DONT KNOW HOW TO QUANTIFY THEM .......... BASICALLY I NEED THE LED SO THAT I SHOULD BE BRIGHT ENOUGH AND BANDPASS SHOULD BE WITHIN 10nm .......... ITS BASICALLY FOR USING AS A SOURCE FOR DETECTING FLUORIDE CONTENT IN WATER ......... WE CAN ESTIMATE THE FLUORIDE CONTENT IN WATER FROM THE ABSORPTION OF THE LIGHT 425nm ( AFTER ADDING A COMPLEX TO THE SAMPLE WATER) ......... I HAVE TO DESIGN THIS INSTRUMENT SO THAT PEOPLE CAN USE IT ANYWHERE THEY WANT AND CAN FIND OUT WHETHER THE WATER IS SAFE TO DRINK OR NOT .......... NOW A DAYS MANY PEOPLE ARE AFFECTED BY MANY DISEASES BECAUSE OF DRINKING WATER WHICH IS RICH IN FLUORIDE..........

THE ABOVE GUEST REPLY IS BY ME .......... ACTUALLY I BY MISTAKE POSTED IT WITHOUT LOGGING IN ....

itsme321,

I did a google search and found this:

http://www.purdyelectronics.com/products/opto/default.cfm?gclid=CKX6sorPi40CFQqtOAodLGH6oA

http://www.marktechopto.com/Products/leds-drivers-displays-products-catalog.cfm?gclid=CKS7-LfPi40CFQZiOAodlnj3oA

http://www.besthongkong.com/

You may do the same, type led into google and on the right side you will find a list of commercial LED merchants.

Yours