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Almost none, the Sutter uses common narrow band interference filters that are well blocked outside the pass band. As you raised this question, I wonder how much heat comes from a LED source -the chip gets very hot in high power applications and about half the power consumption of a LED is waste heat…

Cheers M

 
On 6/11/2013, at 1:48 am, Cammer, Michael <[log in to unmask]> wrote:

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> To join, leave or search the confocal microscopy listserv, go to:
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> 
> How much of the 70 mW is from UV or IR leaking through?
> _________________________________________
> Michael Cammer, Assistant Research Scientist
> Skirball Institute of Biomolecular Medicine
> Lab: (212) 263-3208  Cell: (914) 309-3270
> 
> ________________________________________
> From: Confocal Microscopy List [[log in to unmask]] on behalf of Julio Vazquez [[log in to unmask]]
> Sent: Tuesday, November 05, 2013 5:09 PM
> To: [log in to unmask]
> Subject: Re: Brightness difference Hg vs LED
> 
> 
> A quick comparison in our lab gave the following:
> 
> 488 nm (FITC) band of an LED-based light engine (Lumencor): 40 mW
> 300 W Xenon Sutter illuminator (probably our brightest light source) with FITC EX filter: 70 mW
> 
> both measured at the exit of the fiber or light guide.
> 
> I agree that LED based light engines are probably at least as good (power-wise) as most lamps, plus they have other benefits. Charts such as the one found here should be a good guide regarding relative power:
> 
> http://lumencor.com/wp-content/uploads/2011/09/SpectraX-LE-User-Manual1.pdf
> 
> 
> Julio Vazquez, PhD
> Fred Hutchinson Cancer Research Center
> Seattle, WA 98109
> 
> http://www.fhcrc.org/en.html
> 
> 
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