We are absolutely delighted with the pE-300white light source - it is fabulous. We use it as illumination on our Zeiss Axiskop to basically just identify the objects of desire for further analysis with laser scan of our confocal system. The CoolLED pE-300 has replaced our old and worn out mercury lamp - we love it for its simplicity in use, and even more for its really bright illumination. Before we had to guess the objects, now we can see them clearly. What a difference!