PE = perceived exertion aka, how hard you feel like you are working (not necessarily how much work you are actually doing).
I always find it higher on the trainer for the same power level vs. being outside on the road.
This should help!
SCALE AMOUNT OF EXERTION HOW A CYCLIST MAY FEEL
0 nothing at all still in bed, planning to ride
1 very weak exertion get up, look at bike
2 weak packing up gear
3 moderate flat road; carry on conversation
4 somewhat stronger moderate hill; still can talk
5 strong pumping harder; difficult to talk
6 stronger slightly breathless; talk in short phrases
7 very strong long, steep climb
8 still stronger hard work; can only grunt
9 even stronger toughest ride you remember
10 very very strong feels like Mt. Everest




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