Volt drop across the LED + transistor is <=1.5volt.
= ~3.5volt across the resistor.
3.5 / 112 = 30mA peak.
50% on/off, so 15mA average when actively sending code.
Not a problem to use a lower value resistor.
Octavas:
I think if I add another IR LED they could interfere with each others signal and mix it up unless they are completely synchronous.
Wrong. 38kHz and the frequency of light are far apart.
Older remotes that worked on a 9volt battery had four IR LEDs in series.
Leo..