Five resources on LED microscopy illumination

1. Tutorial on Zeiss product: LED illumination system for widefield fluorescence microscopy

2. Leica product: LED fluorescence light source. 

3. Thorlabs LED products:

Collimated LED Light Source

Modulated LED sources for FLIM

4. Article covering CoolLED product (available from Olympus): "LEDs for fluorescence microscopy" 

5. Research paper: "A new type of microscope illumination and its use in microbiology".