Separate names with a comma.
Discussion in 'GS Boxers' started by Dorsicano, Feb 3, 2011.
Hey!! I resemble that comment!!:fyyff
I am at home and don't have the 46 page tech specs in front of me.... But the LED headlight is an option. Halogen is standard. The pics I saw show what appears to be a full LED light assembly. I'll check when I get to work this morning.
+1 on what EJ_92606 said .....
Halogen with LED daytime running lights (below right of halogens):
Full LED option with daytime running light ring, high beam, low beam, etc:
The area taken by the halogen version daytime light is left open on the full LED version for cooling of the headlight assembly.
Wow looks like the LED headlight assembly needs an electric motor and fan to cool it....... engineering if so.
I am wondering how are they going to filter the air going into the headlight.
Yeah that has me scratching my head. LEDs use a lot less power and should run cooler. That's kind of the point!
True but the heat is at the rear of the LED module, usually large cooling fins required... front is cold. I read somewhere that there could be a problem in the winter with snow not melting, so the fan also brings the hot air from the rear to front of the glass....
Cooling problems is a large challenge of LED car lights
</HEADER>Normally, the light efficiency (photoelectric conversion rate) LED lights is no less than 80lm/W, but the light efficiency of HID lamps can reach up to 90lm/W, halogen lights have even higher light efficiency 201lm/W. According to a recent report, the latest LED technology can increase the light efficiency into a higher level of 161lm/W, which was treated as a breakthrough of LED lighting technology. It is also estimated that in the next 3-5 years, LED light efficiency can be improved by 50% within the same power consuming range. This will not only means that LED lamps will be brighter, but also consumed much less power.
However, lamps with higher light intensity will generate more heat. And the compact arrangement of LED car lights will exacerbate this problem. Even as semiconductor, LEDs produce much less heat than halogen lamps and HID lamps do. But the problem is, heat generated by halogen lamps and HID lamps is usually in the outside of lamps while the tiny heat generated by LED devices is concentrated within chips. Special cooling sections need to be used to conduct all these heat outwards.
Even ignorable heat concentrating onto the small-sized chips still dramatically increases the LED chip temperature due to the limited thermal capacity. The working temperature of LED should keep under 150℃. One solution for this problem is: using multiple LED chips within on lamp, reducing the thermal generation of single chip. Then arrange them in a relatively large space to help dissipating heat. It is an approach that adopted by Koito on Toyota Lexus LS600h series.
According to one manager of Hella, thermal dissipation is one of the most difficult parts of virtual design of LED car lights. The usual process is evaluation and optimization through related simulation software. The selection of simulation package must base on a large amount of experiment results. Challenges from thermal dissipation not only from heat conduction (transfer all heat outwards through “hot pool”, but also ventilation problems. Obviously, natural ventilation is far less enough, so designers from Hella decided to use built-in fans.
Valeo applied another set of thermal management strategy: they set a safe working mode for LED car lights. When the temperature raise to a predetermined value (alert), the control system will automatically turned into the safe mode by cutting the power by 20%. This will cause tiny influence to the brightness of LED lamps, but can effectively maintain the working temperature in a normal level.
Thanks for the images, Paul. I guess my confusion as to what we're getting in the U.S. arises from the fact that I don't see these listed under the Accessories tab for the New R 1200 GS on the BMW USA website
it only speaks to the auxiliary LED's. I certainly hope we'll see them.
From BMW's engineering notes earlier in this thread:
The light unit consists of two LED units each for low and high beam, as well as four additional LED units for daytime running light and side light. These are mounted on a central heat sink made of die-cast aluminium.
Behind the heat sink there is an axial fan. An additional air ducting element directs the warm air onto the glass panel, thereby generating air circulation inside the headlight. This air circulation ensures decondensation of the headlight, also contributing actively to de-icing of the lens in winter.
On this topic, it's also interesting to note the following:
The option also includes a rear light with two light bands, making for an even more high-quality rear view.
So it sounds like the LED tail light only comes on the bike if you order the LED headlight...I guess mixing the two is bad lighting karma ;-)
If I spend that much money I want LED all around. I'll wait.
Can you image how much a complete front headlight LED replacement module would cost?
Accessories are just that, they are not the same as options. It clearly states LED headlight in the BMW USA description.
Technically, you are correct… however, they show several options under that tab… Akrapovic silencer, another windscreen, various footpegs, etc. So my point remains… they have introduced an element of confusion (at this point in time), by not calling out the headlight options. But, it wouldn't be marketing without such, now would it…
The Wheelbase is dead identical and the was only slighty changed
Well maybe it's just me, but any design where you need a fan to cool the head light seems kind of ridiculous. More so on a MC that has adventure pretensions.
Embrace the future! Anything is better than the frequent halogen bulb outages and broken spring clips, right? LEDs handle vibration very well...I have one on my mt bike.
34W lo-beam and hi-beam LED?
As stated somewhere earlier, the fan does more than cool
it is used to dehumidify and deice the lens by blowing the heat from the chips against it.
Those are accessories, not options, just as they've always been and are on any other BMW model. You buy them from the parts department. :huh
Most probably achieved by the design of the reflector. Two separate, but equal LED's
one concentrated for Hi and the other spread out for Lo.