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Old March 11th 17, 02:23 AM posted to rec.bicycles.tech
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Default Decent bicycle light cost

On 3/10/2017 2:35 PM, Barry Beams wrote:

The Oculus runs great in hybrid mode. With both the battery installed, and a generator to 5VDC adapter plugged into the charging adapter, the light stays lit almost endless at the medium setting, which is already brighter to the eye than most of the pothole spotter single LED lights out there.
Candlepower doesn't have a direct translation to Lumens.
"Lumens" is a measure of how much light a lamp produces in all directions. "Candlepower" is the intensity of light at the center of a spotlight beam when measured in one direction. Thus, strictly speaking, you cannot directly convert lumens to candlepower.
Candlepower more directly translates to Lux at a 90 degree angle of incidence, meaning straight on. So it can't say what a light's overall brightness is, only the maximum. Thus Candlepower is a useless measurement to determine a light's usable visibility, only how much of your peripheral vision it will take away.


Have you thought about offering a module for this and marketing the
light to dynamo users. It's a bargain light compared to the cost of a
good dynamo light.

See
http://www.ebay.com/itm/AC-DC-to-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-DC1-5-27V-/321657019357
for an example.

You could design a much smaller unit with a MB16S-TP surface mount
Schottky bridge rectifier and smaller capacitors and no adjustable
voltage potentiometer. The parts cost would be only a few bucks and it
could sell for maybe $25.

There's a seller in China selling a tire dynamo, an AC-DC USB adapter,
and a smart phone holder for $20! http://www.ebay.com/itm/122344796900


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