Ok, your led has a Vf of 2.4 Volts. You want to run it at 30 mA for its rated value (actually you can overdrive the crap out of most reds, often 70 mA)
PP3 9 volt battery.
calculating the limiting resistor.
so Rlimit = 9V-2.4/.030 = 6.6/.030 = 220 ohms. So a 220 is OK, a 180 is quite bright, and 150 is pushing explosion. You want 1/4 watt resistors so you dont set your pocket on fire.
According to the Energizer battery book, a fresh PP3 is 600 mAh, so at 30 mA you'd have 20 hours for one led, in reality a little less then that.
for two leds in series, which makes less heat in your pocket , R = 120 ohms is the nearest standard size, and you'd actually do a little better on the lifetime.
634 nm leds are plenty bright enough, and are a spooky orange red.
As the previous poster mentioned, 10,000 mc doesn't tell us anything without angle data.
if I could afford a liability lawyer he'd tell me to tell you not to do this,tell me to tell you nothing at all, and then tell me to tell you to use some heat shrink tubing on your leads and solder the connections, so you dont experience 2-3 amps of smoke in your pocket. :-)
But if we all listened to the lawyers about non laser sources and hobby projects life would be pretty boring wouldn't it?
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...