> I am just having some difficulty looking at it

without giving a specific answer: translate the heat-stuff to 
electronics. The thermal resistance is a resistor, a heat sources is a 
current source, and a temperature is a voltage.

It will surely matter when the diodes dissipate different amounts. Take 
the extreme cases: when all heat is dissipated by one diode, the 
junction-to-sink resistance of the other one is out of the equation. 
When they both dissipate the same (taking your word for it) you can 
replace them with one diode which dissipates the sum, and has half the 
junction-to-sink resistance.

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Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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