I would like to spend 2,000€, which lamp would you recommend?

Look at California Lightworks. If I was going to spend serious money on a light, this is where I would look. They design and manufacture their own lights unlike a lot of vendors that are just selling re-branded lights from factories in China. They use high end OSRAM LED diodes and mostly make lights for commercial growing, but they now make some nice high end home LED setups.

I don't think you'd be disappointed with either of those lights. I love the look of the Zeus and it's control panel. Plus vote from me for being a British company 😋 The Optic 750S looks really nice as well - 250W less but would be great in a smaller tent (<1.5m) - I like the control over blue and red light and the simplicity of that one with the dials. I personally use Spider Farmer lights and I can't praise them enough, I absolutely love them. They also do a 1000W bar light so I reckon that's worth looking into.

I know a couple of growers that use ecg growtech they are like a ferrari great production can connect to 120 v or 240 v electric i run viparspectra r900 that would be like running a volvo mars and spder farm is almost a corvette and the best ive herd of like the lamborghini of lights would be fohse a31 im partial to buying local so i usually would choose made in america or canada for shiping and repair replacement issues like unkle skunks comment the migro is italian and has some good reviews if you check the lights tab on grow diaries you can see what people are getting with each brand light and its country of origin

Hortibloom Solux 650

if you want to save by lowering the wattage a bit, there's the migro 12 which has 750w but you pay less than half for it

so. lumatek has that little something extra if you add CO2, otherwise they seem to be on par. so if you plan to add CO2, even in the future, go for lumatek. if you don't want to add it, dimlux is fine, but for the same price, I'd go with lumatek :D