The IR LED on Puck.js v1 is http://www.kingbrightusa.com/images/catalog/SPEC/APT1608F3C.pdf - but on the v2 we're moving to 2x no-brand IR LEDs.
That is surprising about the lack of output though - what firmware version are you using? Older firmwares didn't push the IR transmitter as hard as they could so that may cause issues.
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