Simple method to test output of QRP suggested by LB7UG

LB7UG suggested adding two LEDs antiparallel with (in opposite directions) and a 4.7 K resistor in series to my QRP dummy load to get a visual indication of RF output. The idea was that LED should light up while modulating the radio. I tried it out with 5W and 10W output set in my FT-710 radio. May be because it was a makeshift arrangement without soldering, with presumably high contact resistance, it did not seem to work. Then I reduced the value of the resistor to 1K and it worked well at 5W itself. Initial attempt would have failed because of high contact resistance at the crocodile clip level.