Yesterday I did a lot of tests at home with luxmeter, stopwatch and thermometer. I took the three Zebralights bought in 2019 and hardly ever used out of the box (H600Fc - H604c - H604d)
Impressed by my Wizard V3 warm XHP50.2, it holds really high power for a long time before dropping.
Zebralight drops in power much earlier although it must be said that it does not reach the high temperatures of the Wizard.
I also discovered that my H604c is faulty, after 25/30 seconds it has a very rapid drop in power (also visible with an eye) while the H604d bought a couple of months later drops very slowly only after 1 minute.
Thanks for the info on the H600c, I was tempted to buy it but I really think I will stay put.
I have maybe 25 Zebralight and the only problems happened to me only with the MKIV series, after the parasite discharge of the H600Fc (it can happen) here is a problem with the thermal sensor of the H604c.
Strangely, the customer service is unresponsive, they are usually very quick.
I don’t know if after two and a half years from the purchase I can ask for an intervention on this headlamp.