I've always used Bolsius 8 hour tea lights for my tall wax burner (don't use them in small burners as the height of the flame could crack the dish) I went for these red wick ones for the first time due to same day delivery. They don't quite burn for 8 hours like the standard 8 hour Bolsius. More like 7 hours. Other than thst there's no issues, no issues with the wick or low flame as other reviews have stated. They burn perfectly fine with a decent flame. The only time you may have issues and I've experienced a low flame before with 8 hour tea lights is if you blow them out and re light them a 2nd time.