Originally Posted by
Skones MickLoud
Lumens can't convert to wattage, as they measure completely different things. A 1 watt bulb could put out more lumens than a 100 w bulb, and vise versa. Best thing to do would be to open the case (if possible) and look at the bulb, which should have a wattage rating on it.
Not necessarily. The radiant flux of a light is measure in Watts or the radiant energy per unit time. This is the definition of a watt, i.e energy per time. A lumen is the luminous flux of the light source. It takes into account only the light that our human eyes can perceive. We can't see into the IR (below red on the spectrum) or into the UV (above violet on the spectrum). In the radiant flux measurement those are taken into account.
However, I would suspect that the city council that wastan isn't that sophisticated in their definitions. From a practical stand point, a 1W incandescent light is probably in the 12 to 15 lumen range. Get an old incandescent pen light like this
and you'll probably be 2 watts over the 1 watt minimum or at about 45 lumens.
Definitely
not sufficient for night riding
90 lumens is hardly sufficient. More is always better
