I don't have the exact answer to your question. You can somewhat accurately think of I.R. as the heat escaping the lamp... yeah there's more to it than that, but a large part of the heat you feel is really IR. Something that only produces 50 lumens is going to be very dim... but it's still generating a lot of heat... and a lot of IR.
Also I believe you should be using some extra dark Red
Gel, not Blue. I believe at the high end of the spectrum there is some cross over between Red and IR. Blue Gel would potentially block those "near IR" wave from getting through.
How am I doing? Anybody?
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