Normally companies only warranty operation to chip temps of 85 C so you may need to find a company that does business with the military. You can't do a 125 C spec in the (Cree) plastic package, you need a glass hermetic ceramic package. This one goes to 100 C. http://www.cree.com/~/media/Files/Cree/Chips%20and%20Material/Data%20Sheets%20Chips/CPR3BV.pdf With this one, the junction temp can go to 150. http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXPEHEW.pdf You only have 25 deg C headroom for temperature drop from the thermal resistance to air (so you have heat sink concerns).
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