Number of IR LED's that WF2IR Can Power?

I've had my WF2IR for less than a year, I am using it in conjunction with Demopad and an iPad Mini.  Recently my IR blaster stopped working.  I made a blaster myself using some IR LED's that I had.  It works great but I am wondering how many LED's port 3 set as blaster can power and if the output is current limited or do I need to add a resistor?  I measured the DC voltage pretty low at .5VDC, maybe my meter wasn't quick enough though.  The reason I ask is I want to make a multi direction blaster using multiple LED's so the IR signal gets blasted in many different directions, I am thinking 4 LED's or so.




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