Bulb fiasco

  • Thread starter Shawnzyoo
  • Start date
105
0

Main Question or Discussion Point

so i am trying to find taillight/ brake light bulbs
i need a 6v 10 w (12 v 20 w)
and a 6 v 5 w (12 v 10 w)
and autostores are worthless in milwaukee
none of the carriers have the Wattage listed
they have the CP
i amnot sure what the CP is on these bulbs?
is there a direct relationship to figure it out?
thanks
--shawn
 

Answers and Replies

berkeman
Mentor
56,063
6,120
I'm not sure why you would spec a car light bulb at 6V, but here's a helpful website with car light bulb info. Taillights are usually 2057. Does your old bulb have the number 2057 anywhere on it?

http://www.theherd.com/articles/bulbs.html [Broken]
 
Last edited by a moderator:
105
0
sorry its not for a car but for a 1978 Puchs moped
hence only the 6 volts
 
berkeman
Mentor
56,063
6,120
Shawnzyoo said:
sorry its not for a car but for a 1978 Puchs moped
hence only the 6 volts
Yikes! Okay, back to google:

website with older scooter bulbs for sale:
http://www.dynamo.mz-b.de/lights/lampen.htm [Broken]

discussion forum mention of scooter bulbs:
http://www.mopedriders.org/viewtopic.php?t=804&highlight=

MopedWarehouse.com and MopedGuru.com (Tech Support questions):
http://www.mopedwarehouse.com/

light bulbs at MopedWarehouse.com:
http://mopedwarehouse.com/catalog/default.php/cPath/38_40

That last link looks the most promising. Good luck! -Mike-
 
Last edited by a moderator:
Cliff_J
Science Advisor
789
7
CP = candle power, one filament is going to produce more than twice as bright a light when the brake light is applied compared to the running light.

And if you double the voltage, you get 4x the power, minus the increased resistance from increased temperature of the filament, so its ends up at pretty much 3x the power for double the voltage. So make sure you account for this if the CP is given for 12V instead of 6V CP.

For what you looking for, a close match would be 2-3 CP and then 5-6 CP for the two filaments a 6V (or 9CP/18CP at 12V), this is based on a guess of roughly 6Lumen/W and 12Lumen=1CP which should be close enough for this application.
 

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