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Old March 8th 17, 01:56 AM posted to rec.bicycles.tech
James[_8_]
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Default More About Lights

On 07/03/17 11:50, Jeff Liebermann wrote:
On Mon, 6 Mar 2017 20:10:38 +0000 (UTC), David Scheidt
wrote:

Frank Krygowski wrote:
:On Monday, March 6, 2017 at 1:37:23 PM UTC-5, AMuzi wrote:
: I don't know about currents but 6V 4W bulbs for standard
: dynamo systems have been around for twenty years and some
: customers like them. I don't know if the dynamo drag is
: noticeably greater.


:6V 4W? I'm aware of 6V 3W bulbs, which are (or were) used mostly with bottle
:dyno systems when driving a headlamp but no taillamp. They were an alternative
:to 2.4 W in front and 0.6W in back.


:I'm not aware of any common use of 6V 4W bulbs.


It's a standard lantern size.


http://www.rayovacindustrial.com/Products/Lights/Bulbs/K13-2TB-Krypton-Bulb-for-4D-Flashlights.aspx
Ray-0-Vac K13-2TB. Made for 4D cell lanterns. 6v 3.6 watts.
I couldn't find a 4 watt version. Most of what I found were 2.4 and
3.0 watt bulbs for bicycles.


A 6V 3W dynamo will easily power a 12V 6W bulb, but at higher speed.

In the same way, it has been tried and tested to install two 6V 3W
headlights, and a switch that can bypass one light, or connect the two
in series.

--
JS
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