Just thought I'd try to help bring the topic back on topic, so I went and collected some information I hadn't seen yet in the thread.
Mind you, I've never done any real electrical work or circuit design, so I might be barking up the wrong tree. That said, from what I *thought* I kind of understood from reading the LuxeonIII Thermal Spec doc, Thermal Resistance plays some role in the amount of heat put off by one of these, so I thought I'd collect the numbers for comparison.
If I'm totally off-base, let me know and I'll clear the post to avoid gumming up the thread.
Code:Luxeon III Max Lumen: 140 Thermal Resistance: 17 ºC/W Luxeon V Max Lumen: 120 Thermal Resistance: 11 ºC/W K2 Max Lumen: 75 Thermal Resistance: 13 ºC/W P4 Max Lumen: Thermal Resistance [5]: 8.5 ºC/W Thermal Resistance [6]: 6.9 ºC/W [5] RθJ-Bis measured with a SSC metal corepcb.(25 ºC≤TJ≤110 ºC) [6] RθJ-C is measured with only emitter. .(25 ºC≤TJ≤110 ºC) Break voltage of Metal PCB is 6.5kVAC P7 Max Lumen: 900 Thermal Resistance [5]: 3 ºC/W [5] Rθis measured with only emitter. (25 ºC≤TJ ≤110 ºC)
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