These TO packaged IR emitters are great for many projects where power is an issues.  The nanotechnology emitter surface achieves higher efficiency.  The emitters are:

• More stable.
• Less or no drift.
• A lot more power.  
• You can get more power out with the same or less power in (High Efficency).
• A lot less noise (very important).
• Their double sided emitter and backside reflector creates maximum power out.

They also offer these nanotechnology emitters in SMD packages where size and power are important (portable devices and others).

Check out all the TO and SMD versions of this nanotechnology.