Utter and complete RIPOFF!! First and most important, they are NOWHERE near 7500K. More likely it's 3700K. I have some cheap 3800K bulbs that are just as white as these if not a tad more. Further more I could smell that something overheated after a couple of minutes. Turned everything off and back on a few hours later, same thing. Never had this experience before.
Go for something like MTEC Super White instead.
This is my 3800K bulb:
