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Retrofitted LEDs on tailight of my P150 Classic

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  • #241
    Originally posted by zmint View Post
    I gives 100 ohm
    Yeah, and I used a little more to ensure LEDs last for long. You can use 100 ohms too..

    Originally posted by fayad555 View Post
    @abhijeet
    why 14    V supply source and 3v led voltage?
    it should be 12v and 2v resp. right?
    No, battery voltage is not exactly 12V. You may measure with a multimeter and see. And for the LEDs it varies between 2 and 3. I used a conservative value.
    Your biking tells a lot about the person you are!

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    • #242
      Originally posted by abhijeet080808 View Post
      Yeah, and I used a little more to ensure LEDs last for long. You can use 100 ohms too..



      No, battery voltage is not exactly 12V. You may measure with a multimeter and see. And for the LEDs it varies between 2 and 3. I used a conservative value.
      ok...but i designed it for 12v and 2v..hope the leds wont blow off..
      tђє รเlєภt รt๏г๓

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      • #243
        ^^I would recommend 14V atleast.
        Your biking tells a lot about the person you are!

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        • #244
          Originally posted by abhijeet080808 View Post
          ^^I would recommend 14V atleast.
          Mee too think so cuz its more safe for the LEDs but at the cost of the full brightness

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          • #245
            Yeah, and you don't want to be soldering these stuffs every other day!
            Your biking tells a lot about the person you are!

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            • #246
              Originally posted by abhijeet080808 View Post
              Yeah, and you don't want to be soldering these stuffs every other day!
              More brightness more visibility so I would rather say 12V
              Do it Yourself, what so ever, if Possible
              -----------------------------------------
              sigpic
              After Market HID Projector Mod for Pulsar 150
              Flasher Enabled Head Light Flash for Just Rs.1/-

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              • #247
                But you do know that the system runs at around 13.6V, so effectively you are running the LEDs at above their rated voltage/current. And, I have posted some daytime pics of the LEDs. I feel they are bright enough - they are same as Pulsar OEM LEDs, but not as bright as Apache LEDs.
                Your biking tells a lot about the person you are!

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                • #248
                  Originally posted by abhijeet080808 View Post
                  But you do know that the system runs at around 13.6V, so effectively you are running the LEDs at above their rated voltage/current. And, I have posted some daytime pics of the LEDs. I feel they are bright enough - they are same as Pulsar OEM LEDs, but not as bright as Apache LEDs.
                  I know and thatz why our brake lights r getting blown than our HL bulbs
                  Do it Yourself, what so ever, if Possible
                  -----------------------------------------
                  sigpic
                  After Market HID Projector Mod for Pulsar 150
                  Flasher Enabled Head Light Flash for Just Rs.1/-

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                  • #249
                    but mine doesnt glow that bright, may be beacuse i have put 270ohm...
                    we have 5mm 8mm leds etc, is that the diameter of the base of the led?
                    tђє รเlєภt รt๏г๓

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                    • #250
                      Originally posted by sajjt View Post
                      I know and thatz why our brake lights r getting blown than our HL bulbs
                      Dunno about yours, but mine works fine since the install.

                      Originally posted by fayad555 View Post
                      but mine doesnt glow that bright, may be beacuse i have put 270ohm...
                      we have 5mm 8mm leds etc, is that the diameter of the base of the led?
                      Yeah, it is the base diameter. Please don't put values arbitarily. Use a LED Calculator and use the given values.
                      Your biking tells a lot about the person you are!

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                      • #251
                        Originally posted by abhijeet080808 View Post
                        Yeah, it is the base diameter. Please don't put values arbitarily. Use a LED Calculator and use the given values.
                        no i dint put it arbitarily, i calculated that from this site ledcalc.com, which u gave...
                        tђє รเlєภt รt๏г๓

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                        • #252
                          Ok to clear the confusion, here is what to use -

                          5 LEDs in series - 200 Ohms (14V supply, 2V, 20ma)
                          4 LEDs in series - 300 Ohms (14V supply, 2V, 20ma)
                          3 LEDs in series - 400 Ohms (14V supply, 2V, 20ma)
                          2 LEDs in series - 500 Ohms (14V supply, 2V, 20ma)
                          1 LED only - 600 Ohms (14V supply, 2V, 20ma)

                          This is for RED LEDs only. For white or blue LEDs, use 3-3.5V instead of 2V

                          Lower number of LED in series is better because it will make the setup more robust to voltage fluctuations but more tedious as you need to solder more resistors.

                          Hope, everything is clear now!
                          Your biking tells a lot about the person you are!

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                          • #253
                            leds glowing without applying the brake, was the problem of the faulty switch like u said...and it was replaced under warranty...
                            Originally posted by abhijeet080808 View Post
                            I think the brake switch may be faulty. Have you checked that?
                            tђє รเlєภt รt๏г๓

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                            • #254
                              @ Abhijeet

                              If we go for LED's with bigger base diameter its current consumption would be more right? So what should be the desired current while calculating the resistor value? Also i somewhere read that white & blue LED's have a drop of 4.5V.

                              These electronic components are susceptible to minor voltage & current fluctuations!

                              EDIT: Can an H4 bulb be fit in a H7 socket? They both look alike. I was searching for an 100W H7 but couldnt find it. I reckon u use a 100W H4 from Osram. I can do jugaad for the wiring.
                              Last edited by rahul9985; 01-10-2010, 11:27 AM.
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                              • #255
                                Yeah, it depends on the LEDs.. cheap LEDs use 2V, 20mA commonly. And I have used 3V, 20mA for white & blue.. Basically a bit of a guswork since we do not get datasheet for these cheap LEDs...
                                Your biking tells a lot about the person you are!

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