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"K13S/R" Technical Q&A K1200S/R Technical Questions/Answers

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  #1  
Old 08-22-2014, 10:10 AM
Leoist Leoist is offline
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turn signal bulb wattage and lumen output

Anybody know what the stock front turn signal bulb wattage and lumen output is?

Leo
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Old 08-24-2014, 08:22 PM
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Re: turn signal bulb wattage and lumen output

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Originally Posted by Leoist
Anybody know what the stock front turn signal bulb wattage and lumen output is?

Leo
Leo:

From Max BMW parts fiche -
63 21 7 160 935 LONGLIFE BULB - 12V 16W
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Old 08-24-2014, 08:59 PM
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Re: turn signal bulb wattage and lumen output

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Originally Posted by brucev
63 21 7 160 935 LONGLIFE BULB - 12V 16W
Ironically, this "Long Life" bulb burned out on the way home from picking up my then-brand-new K1200GT!

Clearly, the bulb had to have been defective, since its replacement (and its partner on the other side) still work fine 6 years later.
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Old 08-24-2014, 09:06 PM
Leoist Leoist is offline
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Re: turn signal bulb wattage and lumen output

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Originally Posted by brucev
Leo:

From Max BMW parts fiche - 63 21 7 160 935 LONGLIFE BULB - 12V 16W
Thanks Bruce. Now the question is, how does wattage translate into Lumens?

I don't know that part of electrical engineering, but I found a good website: http://www.rapidtables.com/calc/ligh...en-to-watt.htm. Says there that the power in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W). Since lumens is the brightness measure we're interested in, rearranging that equation gives you:

lumens = watts x luminous efficiency

According to the table on that website, LED bulbs have 2-6 times the luminous efficiency of regular tungsten light bulbs. That's why a much lower wattage LED bulb puts out more light than a tungsten bulb.

Using the luminous efficiency quoted in the table, the 16w turn signal bulbs on the K1300S should put out betw 200-280 lumens.

The LED bulb suggested by STXMAN for use in the front turn signals is this one: http://www.ledlight.com/t15-wedg-36-...led-light.aspx. That's a 1.5 watt bulb, which according to the table should put out 45-135 lumens. The webpage says 130 lumens, and also says it's equivalent to a 15 watt regular bulb.

So it would seem that that LED bulb is not nearly as bright as the stock bulb.

STXMAN, what do you say about that?

Leo
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