The Flösser and Osram bulbs are electrically, optically, functionally, and qualitatively identical, but they are labelled differently. They are both built in Germany to exactly the same specification: an H9 burner on an H7 base, 65w at 12.0v, 2100 lumens at 13.2v. Flösser's box says "80w" while Osram's says "65w". This is not an actual power difference, it is a test voltage difference. Flösser power-rates their bulb at 13.5v rather than 12.0v. For any/all filament bulbs, the wattage rises exponentially to the power 1.6 with voltage increase. So a bulb rated 65w at 12.0v will be rated 78.5w (printed as 80w) at 13.5v. It's not two different bulbs, just two different test protocols. On the test bench, the Osram "65w" bulbs and the Flösser "80w" bulbs all test out at between 63.8 and 65.4 watts at a constant 13.2 volts.