Very good questions, I'll have to do some research.
I did some basic WAG type calculations, although I'm an Electronics tech by trade, I figure worst case situation, most current draw, would be while hitting the brake at the same time I have a turn signal selected.
I never did put an amp meter on any of the LED units, but I know for a fact, these little guys draw much less than the equivalent bulb.
I'll break it down like this,
Brake light, the original unit, has maybe 9-14 separate LEDS inside.
Add the new LED's for this light, it has 9 new LEDS. so a few hundred MA's.
Tail light. Dual use 9-14 LED's. plus 8 new LEDS on all the time with the tail light.
Turn signal lights, Original, is a 12 volt single circuit type, I don't know the wattage, but maybe 25-28 watts.
so a few hundred MA's. Now I added a 2 LED yellow side light type to this circuit.
So my basics say I'm adding a maximum of less than a half amp to the alternator load. or 200 - 500MA of intermittent load.
Now I'm sure I'll be running a bigger load once I get my two new smaller passing lights connected under my fairing. I think these puppies are 40-55Watts each.
So 7-10 amps total. And I'm including a few hundred MA's (Milliamps) for the yellow LED side lamps.
But for Grins, I have some spares that I will test to see what they are really drawing. I know it's not near as much as our typical light bulbs. So I'm not worried about it.
I purchased one each of every type I added to the bike as a spare.
These units are made or marketed as BLAZER International.
added today 30Aug11.
OK, I measured the current from two of my spares, the first unit, is 4 inches long, has 6 LEDs included, it's a sidelight unit, I'm using two of them for brake lighting, one unit draws 32ma. And my long lightbar has three short 2 " units, with 3 led's included, So for my total added on brake lighting it's less than 120ma.
I also discovered something else, The same size amber lights draw less, this 4" one drew only 24ma, ok for you non electronic types,
this is .024 amps. 500ma would be a half amp.
Ok, so 120ma for brake lights.
I will check the other light units this weekend. So my WAG was off a bit, it's actually less than 200Ma for the added LED's during full load, this is a turn signal flashing, remember the incandesant bulb in the normal turn signal is running around 23-28watts. this is around 2amps. So with all of my new LED units I'm still drawing less than a tenth of the single turn signal light while flashing.
I will remove the ground connection and wire in the amp meter for a total current load test asap.
Now I"m thinking of changing out all four turn signal lights with LED units.
And an observations, the small LED lighting units are not that costly, when you start going towards headlight type outputs, then you start adding up the cost. My bike is not a show bike at all, so I'm not going overboard with show lighting, just want to be very obvious to others on the road. I have found out that no matter how many lights or strobes you have flashing, some cage doinks still don't see you. So I'm the invisible biker type, they sometimes hear me, or get blinded by the lights lol. But I don't assume anything.
Last edited by dcody40; 08-30-2011 at 01:22 PM.
Reason: more info added.