Thanks for your answer @ryans 🙂
The problem is that I've never tried any waveform lightbulb so I'd need to try them out before buying a stock of them. Nevertheless, shipping fees alone are prohibitive where I live (more than 80$), and it hurts to pay such a price to try a single lightbulb first, and buying a bunch of them again with such shipping fees. If I was sure they're ok, I wouldn't mind doing so.
Yesterday I found halogen lightbulbs on aliexpress so I may consider it until I find acceptable LED lightbulbs