miglo
New Member
Posts: 2
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Post by miglo on Dec 23, 2017 5:51:06 GMT
So what happens if you try turn the brights on, will it cause any harm? Also, does the resistor get really, really hot? If yes, you could mount a resistor with a heat sink I guess.. Sorry did not read your presentation in "New Forum Members Introductions" Lol, ok...
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Post by ghostrider.1127 on Dec 23, 2017 11:03:32 GMT
It´s called netiquette BTW
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Post by charwood23 on Jan 10, 2018 18:07:38 GMT
I have found a 3 watt, 27 ohm resistor locally. Would that work or is the wattage higher? That will. The wattage is basically a guide to how much heat the resistor can handle in basic terms. A higher wattage will still do exactly the same but will be bigger and may even have a heat sink. What you're doing with the resistor is reducing the current, like squeezing a pipe of water, to the main beam. In this case the high beam feed is basically shorted to the running beam feed via a resistor so both lamps are on. If you used a bit of wire (zero ohms) you will get the high beam lamp on at 100% all the time. What the resistor is doing is reducing the current to the main beam lamp so it comes on at far a less power (25% or so) so therefore dimmer. Lower the value if the resistor and the light will be brighter. However when reducing the current a side effect is heat. Where your water pipe would back up with water and maybe begin to overflow, current does the same. The resistor gets rid of this back up of current by using heat. The higher wattage the more heat it can handle and the cooler it will remain. For electronic circuits this is an issue as we want small and cool. For what we are doing here it doesn't really matter so you could stick in a 10W (which would be big) if you wanted. In all this looks like a cool and very cheap mod. My only reservation is if it goes pop then it's £700 to replace 😮
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Post by dangermouse on Jan 11, 2018 0:23:50 GMT
Now I’m assuming these new headlights draw much less current than traditional incandescent light bulbs – now let’s assume a quarter of the current (say 1 amp), a 27 ohm resister at 13.7 volts will have to dissipate 13.7 watts of heat - fire territory unless it's a power resistor designed for that kind of load. Up to 2 amps at 13.7 volts (@1 Ohm) will equal 4 watts - which is all what many half decent power resistors can safely manage - has anyone actually tested the draw on these lights to get a feel for the amperage? Then we can do some meaningful calculations.
A bog standard resistor is usually rated at a quarter of a watt, that will give you a maximum safe current draw of 0.5 (half) an amp at typical automotive voltages. For all I know that may be all a new-fangled MT-10 headlight draws – but until we know, I think people should tread carefully. A 1 ohm 25 watt wire wound power-resistor only costs about three pounds – I’d say be safe rather than sorry!
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Post by tigertim on Jan 11, 2018 6:17:44 GMT
I see what’s being attempted here, and appreciate the value of increasing the likelihood of being seen by other road users by having both lights illuminated 👍 However, even if the main beam lamp is not fully lit, the fact remains that it’s beam pattern will interfere/ cause glare to other road users, especially in darkness🤔 Just saying 🧐
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jan 11, 2018 9:06:27 GMT
I too can understand what people are trying to do. If I am going to mod my bike, it has to be worthwhile, be it for looks, or functionality, for me this is neither.
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Post by charwood23 on Jan 11, 2018 16:19:03 GMT
I see what’s being attempted here, and appreciate the value of increasing the likelihood of being seen by other road users by having both lights illuminated 👍 However, even if the main beam lamp is not fully lit, the fact remains that it’s beam pattern will interfere/ cause glare to other road users, especially in darkness🤔 Just saying 🧐 There's enough people on the road who don't see us as it is. If causing glare to someone means they see me so be it.
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Post by ghostrider.1127 on Jan 12, 2018 5:43:17 GMT
Now I’m assuming these new headlights draw much less current than traditional incandescent light bulbs – now let’s assume a quarter of the current (say 1 amp), a 27 ohm resister at 13.7 volts will have to dissipate 13.7 watts of heat - fire territory unless it's a power resistor designed for that kind of load. Up to 2 amps at 13.7 volts (@1 Ohm) will equal 4 watts - which is all what many half decent power resistors can safely manage - has anyone actually tested the draw on these lights to get a feel for the amperage? Then we can do some meaningful calculations. A bog standard resistor is usually rated at a quarter of a watt, that will give you a maximum safe current draw of 0.5 (half) an amp at typical automotive voltages. For all I know that may be all a new-fangled MT-10 headlight draws – but until we know, I think people should tread carefully. A 1 ohm 25 watt wire wound power-resistor only costs about three pounds – I’d say be safe rather than sorry! draw , round about 1,5 Amps as they are 18W ( on 12.1V ) .
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Post by ghostrider.1127 on Jan 12, 2018 5:50:35 GMT
I too can understand what people are trying to do. If I am going to mod my bike, it has to be worthwhile, be it for looks, or functionality, for me this is neither. Don't have to be everyone's cup of tea , most of us are interested in. Also , in my bikes not that much can be replaced anymore .
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Post by dangermouse on Jan 12, 2018 18:09:57 GMT
draw , round about 1,5 Amps as they are 18W ( on 12.1V ) . Cool, so that's about 2.25 watts with a 1 ohm resistor and 60 watts with the fellow above's 27 ohm resistor.
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Post by espritgv on Feb 13, 2018 13:14:39 GMT
That´s quite all , 24-27 ohm resistor between red and green wires those wires are out of the control light unit going to the lights Enjoy The red wire is for the low beam and the yellow one for high beam? I was thinking, why not drain from the small led above? less danger that it can go wrong with the hole unit and throw away €700,-.
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Post by ghostrider.1127 on Feb 13, 2018 19:09:05 GMT
Feel free to experiment other solutions , i´m happy with that .
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slawa
New Member
Posts: 2
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Post by slawa on May 21, 2020 9:05:25 GMT
draw , round about 1,5 Amps as they are 18W ( on 12.1V ) . Cool, so that's about 2.25 watts with a 1 ohm resistor and 60 watts with the fellow above's 27 ohm resistor. Please,could you summaries this topic? What is the best way to modify the lights? What resistor should be used, a 27 Ohm 1 Watt resistor or perhaps it would be better to use a resistor with 27 Ohm and 5 Watts? I would be thankful if you could help
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slawa
New Member
Posts: 2
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Post by slawa on May 21, 2020 9:15:41 GMT
That´s quite all , 24-27 ohm resistor between red and green wires those wires are out of the control light unit going to the lights Enjoy Please, could you tell how it works? If you turn the bike on, are both lights already on? Or do you have to put the high beam switch on? Do you have got any trouble with this kind of solution? Thank you in advance! 😁
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