Hi Chris,
That shield has both IR Transmit and receive. Do you need that?
If you are only transmitting IR all you need per channel is an IR LED and a resistor (probably 150 to 200 ohms). If you need more power, the driver transistor circuit shown in that shields schematic would be OK.
See: http://goo.gl/cm3iU These are like 10 cents each.
You may need to put these in small tubes to restrict the transmitted beam to the light you are trying to control..
Let us know how you make out!
DISCLAIMER: Mentioned stuff from my own shop...