I dont think it's about the brightness, it's about the build quality of the case that the LEDs are kept in. You're right - LEDs are LEDs, but if you put them in a leaky box with metal that will rust, they're worthless. Put them in a solid leak proof rust proof box with thicker gauge wire.... it's more expensive but a better long term investment.
completely correct.... Brightness isn't that important, more so how the light is projected/reflected.
when you look at comparisons done by magazines they have different light meters at different distances from the vehicle and different angles both side to side and up and down
Reflectors, Lenses, Build materials, metals, plastics, polycarbonates, glass all play into prices on LEDs
IP scale does also.... pretty much a torture test for these lights that see what they can stand up to.
moisture and dust getting in, warranty info, specs and build quality of the control board, type of wire used for power, gauge of wire
if it is a complete kit also plays into it. all wires, relays, fuses and switches are they included?? whats the quality of those items???
I saw an article in Australian 4wd that put brand names up against "
amazon/
ebay" ones and none of them even came close... not saying that they aren't a good buy for the money. If you are on a budget then the
amazon ones are a great buy