Yes, those will work fine, they look like the European version of the HydroHut. Are you using two because one is for vegging and the other for flowering? Because they do make one that is 1.4m x 2.5m (approx) that is twice as wide. 400w will work but 600w would be great. I started mine with 400w but found that if I really wanted the big nugs I needed a bigger light - the digital 600w puts out almost 2x the lumens as a 400w.

Good Luck & Happy Growing!