A Narrow beam long range is best for bouncing off walls.
SFH 4550 OSRAM
1100mW/sr @ 100mA
1.5V typ 1.8V max @100mA using peak current.
rated for 1A < 100us Abs. Max
6deg 5mm lens
T 1-3/4 = 5mm radial leaded
Consider 2 AAA batteries in series from 3 to 2V range.
100mA CC sink.
or a 1.5V/0.1A = 15 Ohm series resistor for 1.5V typ on LED
If your LED is 1.8V then 1.2V/0.1A= 12 Ohms
Efficiency here is the mW/sr /mA and is best found in narrow lens LEDs to amplify the beam at some lens loss. Because SMD LEDs cannot be molded with a narrow beam lens the same as TH LEDs, the wide beam means the intensity is far less.
A constant current source is best for current regulation using a high hFE output transistor preferably to achieve low Vce(sat) that is also rated for > 100mA.
simulate this circuit – Schematic created using CircuitLab