I'm with Larry on this one.:agree:I wouldn't touch LED H7 replacements with a 10 foot pole. They are a scam. Their output is a fraction of the output of a halogen lamp. They are also not DOT legal.
In addition to the low output, it will act like a floodlight. The reflectors in your headlight housing are tuned to one point, where the filament is. With the dozens of LED's in one of those headlights, there is no one focal point, which screws up the cutoff.
The LED options offered by some of the mfrs cost thousands of dollars, unlike the $10 H7 replacements. High power LED's generate a lot of heat, and those OEM LED headlights have massive heatsinks attached to the LED's. One of the versions is glycol cooled.
You are right Dennis. Cars do have them. And the output is actually better than a halogen lamp. But those lamps cost thousands of dollars. Lexus, Audio, and Cadillac also have LED headlights.No personal experience here..
but the top Prius has LED headlights
and the chatter on those boards is that they are better...
nothing scientific but the pictures look promising..
Top: Prius III Halogen headlights and .. Bottom: Prius V's LED headlights:
Both are complete with projectors..
led 4:dont do it . i just sent back led 9006 bulbs for fog lights 4:4:4:4:. the parking lights were better NOW , HID IS THE WAY TO GO . THAT WHAT THE CARS ARE USING:excited:, AND ITS WHAT IS IN MY LOW BEAMYou are right Dennis. Cars do have them. And the output is actually better than a halogen lamp. But those lamps cost thousands of dollars. Lexus, Audio, and Cadillac also have LED headlights.
But also keep in mind that even with the high cost involved, all of the OEM applications have to use multiple housings to get adequate light output. A single lamp array with adequate light output doesn't exist, no matter how much money you are willing to spend.
And Daytime Running Lamps are becoming almost commonplace. Their lower output means mfr's don't have to be concerned about controlling the light pattern, making it is easier to get regulatory approval.
LED has become a huge buzzword in the past 10 years, and I am as interested in the technology as anyone. We are all used to owning products with low power LED's that last a lifetime and draw very little power.
But a problem happens as power output increases. LED's become less efficient as their brightness increases, and their reliability drops considerably. OEM LED headlights draw nearly as much power as a halogen equivalent, and generate a lot of heat. The big problem is that unlike a halogen, which radiates its heat forward, LED's radiate their heat at the back of the substrate. Finding ways to dissipate the heat is a big problem. LED's are semiconductors, just like the transistors, diodes, and IC's that are built into the products we own. When the semiconductors in those products get hot, they become less reliable, and are more prone to thermal runaway and failure. Heat is the prime enemy of all semiconductors.
For now, even if you could by an aftermarket retrofit that had adequate light output to replace halogen bulbs, (which you can't), a lamp with that high of an output would not offer any advantage over what we use now.
We will get there someday. We are probably on the brink. But even though they will be less wasteful and more reliable than the products they replace, they will probably never reach the lofty goals that were once promised.