On Apr 19, 2008, at 4:20 PM, David VanHorn wrote:

> The swamp I'm trying to drain, is how much energy is a given LED
> painting on the scene at 30' (or other distance)

Are you making things more difficult than they need to be?  I mean,  
ALL of the energy is painting the scene at 30 feet, and any  
particular spot has intensity falling off proportionally to  1/d^2,  
right?  You just need the particular constants associated with the  
"usual" equation...

BillW

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