plaver
Junior Member
Posts: 74
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Post by plaver on Aug 3, 2019 18:56:31 GMT
Hola, ¿alguien sabe cómo se reduce la intensidad de la luz de freno?
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Post by dv52 (Australia) on Aug 3, 2019 23:34:32 GMT
To lower the brake light illumination - reduce the value in the channels below: Leuchte20BR LA71-Dimmwert AB 20 Leuchte21BR RC8-Dimmwert AB 21
Don
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plaver
Junior Member
Posts: 74
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Post by plaver on Aug 4, 2019 4:27:34 GMT
Thank you very much for your help.
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Post by snowj720 on Aug 5, 2019 21:57:57 GMT
Thank you very much for your help. If I did the 5 brake light Mod will changing those values up or down change all 5, or are the additional inside lights seperate?
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Post by dv52 (Australia) on Aug 5, 2019 23:31:25 GMT
Answers -in the order asked = No, Yes
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Post by aussietig on Aug 5, 2019 23:44:09 GMT
Can I ask why you would lower the brightness of your brake lights Surely the brighter the better to be seen at all times, especially in bright sunlight.
Seems counter intuitive to me and maybe illegal in some jurisdictions if they have specified light outputs for said lights
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Post by snowj720 on Aug 6, 2019 1:01:31 GMT
Can I ask why you would lower the brightness of your brake lights Surely the brighter the better to be seen at all times, especially in bright sunlight. Seems counter intuitive to me and maybe illegal in some jurisdictions if they have specified light outputs for said lights Exactly. I'm looking to brighten mine if I can. I put a light tint on mine and want to make sure I'm seen.
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valk
Full Member
Posts: 112
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Post by valk on Aug 6, 2019 13:36:03 GMT
Can I ask why you would lower the brightness of your brake lights Surely the brighter the better to be seen at all times, especially in bright sunlight. Seems counter intuitive to me and maybe illegal in some jurisdictions if they have specified light outputs for said lights Exactly. I'm looking to brighten mine if I can. I put a light tint on mine and want to make sure I'm seen. I’ve brightened my brakelights to 126. @ 127 they will stay on all the time. Just so you know...
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Post by dv52 (Australia) on Aug 7, 2019 0:04:12 GMT
Exactly. I'm looking to brighten mine if I can. I put a light tint on mine and want to make sure I'm seen. I’ve brightened my brakelights to 126. @ 127 they will stay on all the time. Just so you know... valk: I'm not sure what type of brake light fittings are installed on your car but the BCM (the module @ address hex09 that controls the car's 35 x exterior lights on a mk7) is a very sophisticated controller - it's actually like a mini-processor (see the PC board below).
Anyhow, the BCM uses very different Pulse-Width-Modulation architecture to control incandescent and LED lamps. The value 127 can only be used if (and only if) the lamps are LED because the BCM employs digital PWM.
If you have incandescent lamps, the BCM uses analogue PWM and lots of stuff changes (like the modulation frequency and the dimming ratios). For incandescent lamps (which is determined by the Lastyp setting) the maximum permissible value is 100.
The fact that 127 is higher (numerically) than 100 doesn't mean anything - the two values result in maximum illumination for both types of lamps. 128 (being 127 plus an extra state for 0) is simply the binary equivalent of hexFF for digital control - I doubt that any sentient human is able to distinguish between 128 shades of lamp illumination!! Don
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valk
Full Member
Posts: 112
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Post by valk on Aug 7, 2019 6:46:25 GMT
I’ve brightened my brakelights to 126. @ 127 they will stay on all the time. Just so you know... valk: I'm not sure what type of brake light fittings are installed on your car but the BCM (the module @ address hex09 that controls the car's 35 x exterior lights on a mk7) is a very sophisticated controller - it's actually like a mini-processor (see the PC board below).
Anyhow, the BCM uses very different Pulse-Width-Modulation architecture to control incandescent and LED lamps. The value 127 can only be used if (and only if) the lamps are LED because the BCM employs digital PWM.
If you have incandescent lamps, the BCM uses analogue PWM and lots of stuff changes (like the modulation frequency and the dimming ratios). For incandescent lamps (which is determined by the Lastyp setting) the maximum permissible value is 100.
The fact that 127 is higher (numerically) than 100 doesn't mean anything - the two values result in maximum illumination for both types of lamps. 128 (being 127 plus an extra state for 0) is simply the binary equivalent of hexFF for digital control - I doubt that any sentient human is able to distinguish between 128 shades of lamp illumination!! Don
I have a euro mk7 gtd, with oem mk7 R led tail lights. My experience is that when I increase the value to 127, the brakelights stay on. I don’t know why, but that’s what I saw
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Post by dv52 (Australia) on Aug 7, 2019 7:43:30 GMT
I have a euro mk7 gtd, with oem mk7 R led tail lights. My experience is that when I increase the value to 127, the brakelights stay on. I don’t know why, but that’s what I saw valk: OK if you already have LEDs fitted, then generally the max value is 127 - but there are a couple of Leuchte-commands that still restrict the maximum Dimmwert value to 100. The "Bremslicht" is one of these commands and ALL the factory settings that I've seen have the related illumination level of 100 - regardless of lamp type.
Like you - I also don't know why this happens
Don
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Post by dv52 (Australia) on Aug 7, 2019 22:39:20 GMT
With all this just add that in my view a binary or hexadecimal, 100 is not the same as 127 (or 126), the values are different and therefore the coding that stores the BCM is also different.
wgolfmk7: Thanks for the comment.
Many years ago (probably before you were borne) when my early lecturers were desperately trying to instill lighting design principles into muddled headed students - I was taught the folly of comparing the way that folk perceived lighting effects.
The reality is that while we all see the same light - as those photons enter our retinas and as they are interpreted by our brains, we perceive the effects of lighting very differently. So I have absolutely no doubt whatsoever about the veracity of your observations. And I'm also very impressed at your dedication and the scientific process that you have applied in developing your hypothesis - well done!! With regard to your assertion above - I make the following comments: My actual statement was: The fact that 127 is higher (numerically) than 100 doesn't mean anything - the two values result in maximum illumination for both types of lamps.
So - what I said (clearly not said well because it has caused confusion) is that for incandescent settings in the Lastyp channel, a Dimmwert setting of 100 will yield full illumination. And, if the Lastyp channel has a LED setting, a Dimmwert setting of 127 will likewise produce maximum illumination.
As I have also said - the BCM uses the common process of PWM to control illumination. I took the following snapshot some time ago (with my oscilloscope) from a lamp pin on the BCM of my test bench with a LED setting in Lastyp channel and a Dimmwert value of 63 . I have included a pic below from my tests to demonstrate how the BCM handles the Dimmwert function:
The PWM process is clearly evident in the picture.
I can confirm my observations using my oscilloscope on my test-bench as follows: for all incandescent settings with a value of 100, the oscilloscope trace is a "flat-line" @ 12 V (i.e. 100% duty-cycle) and I can also confirm that this is exactly the same with LED settings and a value of 127.
Now- as to whether there is a perceivable difference FOR A PARTICULAR LED SETTING in the Lasttyp channel between 100 and 127- this depends entirely on the particular LEDs in the fittings (not all LED lamps dim in the same manner) AND most importantly, it depends on the particular eyeballs observing the lighting effects.
again - many thanks for sharing your observations
Don
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