Thanks!!!
I followed this guide - and added first one and after second R050 resistors, borrowed from broken ballast and succeeded!!!
The results are:
1.Stock (3x R050) the input power is 12.13V * 4.01A = 48.6W
2.Modded 3+1x R050:
input power 11.5V * 5.31A = 61.1W
output power 111V * 0.44A =...