If you watch the videos on youtube from the likes of AvE or Bigclive you'll be shocked at the poor quality and dodgy practices of some of the LED lights. Unfortunately it seems you get what you pay for when buying the cheapest models.
It would be nice if by paying more you were guaranteed better quality but unless you buy a known good make from a reputable seller that isn't always the case.
I've watched Bigclive, Mikeselectric and Julian Ilett on YouTube for years.
Electronics, particularly Optoelectronics has been a hobby of mine, since school days. LEDs are my favourite light producing device. I've been playing with high power CREE emitters since they were developed in the mid 90s. I've quite a collection of them in my workshop.