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I would check out the new X-Cite LEDs.  There are 2  versions: 120LED (direct coupled) and 110LED (liquid light guide).  
I have used only the 120led  and found it to do the job just fine.
 
The main thing for me is the company is reliable and has been around for a long time...

 http://www.excelitas.com/Pages/Product/X-Cite-110LED.aspx 

No financial interest....

Dr. Ammasi Periasamy
Professor & Center Director
http://www.kcci.virginia.edu/contact/peri.php
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-----Original Message-----
From: Confocal Microscopy List [mailto:[log in to unmask]] On Behalf Of Raj Patey
Sent: Thursday, December 18, 2014 4:53 AM
To: [log in to unmask]
Subject: Re: LED lightsource vs classic xcite

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Great to see this discussion going on as LED illumination systems become more and more mainstream.

A point on Searchlight: unless you put specific power values in the advanced section then you cannot use it to compare power as most of the light source curves are either normalised to 100% or only relative to themselves rather than any particular value. Putting power values in is a challenge as there is no standard from the manufacturers on how to measure power and therefore no basis for a comparison other than try it! After evolution of LED solutions over the last few years it is generally found that intensities are now suitable for the majority of peoples needs.

To be blatant, please have a look at www.coolled.com We offer a wide range from single wavelength through everyday but controllable white light and up to a very flexible high end (but not high price) solutions.

Raj Patey
CoolLED Ltd.