LED headlight project.
#31
exactly like we have said above . We can easily make 2500lumens and project a nice cutoff through a hid projector with a single led. The part that is hard is making it in a bulb size package . When theres that much heat, heat sinking must be huge . Thats why there is no company making them . Luxeon doesnt have much in terms of that lumen amount coupled with decent efficiency . Cree and Luminus do however . A few more years and there will be LEDs that can surpass HID with minimal heatsinking . If you have ever seen the oem cars with LED low beams you will see heatsinks are the size of the whole headlight and they are only put out lumens equal to hologens . Our goal for the future is to have a drop in d2s LED lowbeam replacement . 5 years ago if someone said they were gonna make equal power to hid with LED they would be laughed at . With the pace that LED technology is at now its becoming realistic .
Last edited by LEDmarkers; 06-02-2011 at 11:21 PM.
#32
As for lumen levels, I believe the headlights total put out 3000 lumen not 3000 per side which is why running 2 at 900 lumen in each side would be equal to if not greater than HIDs
also as for having a D2s replacement bulb that will be very very hard. the optics needed for focusing light from LEDs is much different than how light is emitted by an HID bulb. the HID bulb is essentially a point light source with light radiating in all directions thats why projectors have Parabolic reflectors to capture that light. An led however will never emit wider than 180 degrees of light because it emits it in one direction from the surface. therefore the parabolic reflector is completely unnecessary when making a projector with a LED
Last edited by 6mt2nr88; 06-03-2011 at 12:10 AM.
#33
LOL what do you want done to them?
As for lumen levels, I believe the headlights total put out 3000 lumen not 3000 per side which is why running 2 at 900 lumen in each side would be equal to if not greater than HIDs
also as for having a D2s replacement bulb that will be very very hard. the optics needed for focusing light from LEDs is much different than how light is emitted by an HID bulb. the HID bulb is essentially a point light source with light radiating in all directions thats why projectors have Parabolic reflectors to capture that light. An led however will never emit wider than 180 degrees of light because it emits it in one direction from the surface. therefore the parabolic reflector is completely unnecessary when making a projector with a LED
As for lumen levels, I believe the headlights total put out 3000 lumen not 3000 per side which is why running 2 at 900 lumen in each side would be equal to if not greater than HIDs
also as for having a D2s replacement bulb that will be very very hard. the optics needed for focusing light from LEDs is much different than how light is emitted by an HID bulb. the HID bulb is essentially a point light source with light radiating in all directions thats why projectors have Parabolic reflectors to capture that light. An led however will never emit wider than 180 degrees of light because it emits it in one direction from the surface. therefore the parabolic reflector is completely unnecessary when making a projector with a LED
#34
Actually everything above is completely wrong . Our LED turn signals put out 900 Lumen per LED . A D2S hid bulb depending on the bulb puts out 2500-3000 lumens in a single bulb . A LED at 900 lumens would be a little more than half the lumen output of a hologen .Thats good for a drl or turn signal but no where near enough for a driving light . You are also wrong about LEDs not being able to fire into the parabolic reflector (bowl) and create a prefect cutoff using a d2s base and single LED. We have done it before so it sure is possible and works great . There are optics out there that can do whatever you need with LEDs . In that case we did need to get more lumens outputted with the loss through the optics . The only problem we have is the size of the heatsinking needed coming off of the D2s base was much to big to fit inside a headlight but it does work fine and puts out enough lumens to be considered a driving light but not yet equal to hid expecially since its less efficiant drawing more wattage then HID which defeats the main purpose of LED .
As for your claim that your turn signals output 900 lumen I would love to see them actually measured. because that is an insane over exageration.
in the picture above is a 900 lumen LED its a cree P7 check the manufacturing specs of it its rated 700-900 lumens so it probably is less than 900 because nothing ever outputs nearly as well as the spec sheets. I promise thats a hell of a lot brighter than than your turn signals. in order to output its 900 lumens it runs off of 3.7 volts at 2.8 amps thats over 10 watts. again you can check the spec sheets for the led.
here is the output installed in a projector in comparison to the projectors on my g35 which each have 6000K bulbs the 2 outter lights are the g35 headlights the inner is the LED
it is just as bright as the HIDS but it has less area covered hence why it is not as many lumens alone.
having a turn signal that is truely 900 lumen would be like blinking a headlight.
As for projector mounting let me rephrase what I meant. the use of a parabolic reflector is not needed. the light only emits from one side of a LED therefore you just orient the led facing the lens. the only purpose of parabolic reflectors is capture the 180 degrees of light emitted from a HID bulb which isn't facing the lens. and since we don't live in a perfect world there is some light lost in the parabolic reflector. thus to use a parabolic reflector,make that any reflector at all, for a LED just creates a higher loss in light. because a more effective way would to just have the LED face the projector lense. this is what I did and this is the cutoff line from the same cree P7 led:
So what I meant to say is not that it cant be done. but it just isn't practical because there is a much easier and more practical way to make them which will result in superior output.
an easy way to relate this would be pretend the Led with parabolic reflector and projector is an octagon. it sure rolls better than square(regular headlight) but it doesnt roll as well as a circle(the LED with just projector lens)
Last edited by 6mt2nr88; 06-03-2011 at 01:52 AM.
#37
im not arguing what the output of the bulb is.. What I'm saying is that you don't get nearly that output becasue not all that light is visible and some is lost in the housing. the output after being in a housing and takign into account the light which isnt in the visible light spectrum is what is around 1500 lumens per HID...
But I am still curious about your magical 900 lumen turn signals... can I see the spec sheet for the Led you "USE" for that
But I am still curious about your magical 900 lumen turn signals... can I see the spec sheet for the Led you "USE" for that
Last edited by 6mt2nr88; 06-03-2011 at 09:26 PM.
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