After the first shots, it became clear that the photos are not able to show the full picture. The photo shows the differences, but in reality, the differences between the lamps are striking. I can say that ultraviolet bubbles shone much brighter from Phillips bulb, we can say 2-3 times brighter than from all the others. This was noticed by all 4 people who attended the test-review.
The pear-shaped bulb got very hot during the 10 minutes of the test. It was its big flaw.