I have a few different suppliers I have deal with for 5mm conicals. First and foremost CDI, then also tried S4 last year. I currently have both CDI and S4 on the same display. CDI I know is minleon, S4 presentation - the color is identical, however different set construction ie rectifiers and location. I can tell you for a fact the CDI stuff will burn 24/7 for several months, sample I got years ago went for 2 years in the shop and is still used 3 more years later.