Hi Caroline,

I'm a big fan of the ThorLabs LEDs. They're cost-effective 
and come ready to go for all major microscope brands 
(Olympus, Zeiss, Nikon, Leica). I haven't done it myself but 
the collimating lens and mount should make it easy to put on 
a light guide.

Helpful link:
http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=2615

It's about $350 for the intial setup (mounted LED, 
collimating lens, mount/threads for microscope) and 
additional colors (mounted LEDs) can be had for about $100. 
(yes, less than the cost of Hg bulb for 100k hours of use... 
sweet!) Also, they sell a power supply for $250 or you can 
build your own for less.

No commercial interest. Just a happy user of cheap LEDs 
who's delighted to not be constantly changing Hg bulbs anymore!

- Neville

Caroline Bass wrote:
> Hey Guys,
> 
> I’m trying to find a blue LED light source for a cheap GFP dissecting 
> microscope. Does anyone know of a cheap illumination system, I basically 
> want a standard light source with gooseneck light guides, but instead of 
> a white halogen light I’d like to have blue light of a wavelength 
> appropriate for GFP. I’ve been playing around with 3W blue LEDs but I 
> don’t have a good way couple the LED to a light guide. Any and all 
> suggestions are welcomed!
> 
> Thanks,
> 
> Caroline