Quote Originally Posted by LightningSpeed
Is it always the more expensive it is the better? How are you able to tell the difference of quality between different priced LEDs? Before purchase
well that depends on the LED you are buying- the 3,4 and 5mm LEDs have been around for more then 20 years, so they are down to the
however, when you're talking about a LOT of light out of LEDs (generally referred to as 1 watt, 3 watt etc) these LEDs have only been around for 5 yrs or less; so a good quality LED with major engineering hours behind it will cost you more

this is why you don't see a lot of LEDs options for head lights- only a couple of companies in the industry work closely with car manufactures to engineer this type of "super/ hyper bright" white LEDs (I hate this terminology- but sometimes you've got use the "verbag of the general public).

Nothing out of China is up to par yet for headlights... if you are looking for a good product, expect it to cost at LEAST $100 for a head light bulb replacement, but I would guess it to be even higher then that to get anything good.

Major issues to concern yourself with:
-color quality (cheaply made white LEDs turn blue- the prosper process is poor)
-lifetime (true you're not going to drive your car until your dead, but you want a manufacture's warranty on the product- and just FYI if its a good LED, chances are the LED will last longer then other electronic components of the light engine)

that's kind of it... remember its worth the research and happy shopping