Hi Russell: The 1 ma is regulated in the Fluke 87 in diode mode. Here are some numbers: mA Volts 1 2.52 10 2.62 25 2.71 50 2.85 100 3.08 150 3.30 200 3.41 250 3.65 300 3.84 400 4.23 At 200 ma the "filament" was warm and at 400 mA it was to hot to hold and s= hortly started to smoke so ended testing. --=20 Have Fun, Brooke Clarke https://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html axioms: 1. The extent to which you can fix or improve something will be limited by = how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. -------- Original Message -------- > Nichia NSPWR70CS-K1 LED --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .