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Once you've done a few rides with the PM you should know what kind of TSS values you get for what kind of ride. If I ride without my PM I just make the TSS value up based on common sense and experience, using perceived effort.
So don't bother with the HR, just make the TSS up, from experience. The HR TSS will be no better.HR is so variable.
skinny
@Ste_S
Recently bought a power meter and after doing a FTP test on TrainerRoad it also gave me a corresponding Lactate Threshold HR reading of 150pm.
I'd previously based my LTHR on 0.95 x my average HR during a '10' TT = 164bpm.
Effort during the FTP test wasn't low - my HR at the end of the test was about 174bpm, roughly a similar HR to the one I end a '10' on.
Which should I use for setting HR zones ? Purely for generating a TSS number for when I'm not using the Power Meter.