Low energy lamp deliver best so far and I understand now why. I have measured up the two lights. Led lamp of 18W draws only 10,9 Watt the supply not 18W. Low energy light pulls 19,2 Watts is not so strange that the low energy light is better.
It seems as if one can be deceived, even when it comes to how much power a plant led lamp to deliver. I continue this test still even if it now is misleading when it comes to the effect. Have you bought an led on 18 Watts so expect it to deliver what it purports to deliver or else get well indicate that it is on 18 Watts but the supply 11 Watt to the plants thus significantly less than expected.
In the future I will measure out all lights before the test starts. Here you a plant led lighting so check it for it is not sure that it delivers what it claims to supply.