>gimmicky multiple settings. The low wattage settings on the Nightrider are
>very inefficient. Though Nightsun systems don't look as polished and aren't
I wouldn't call it very inefficient, just plain-old inefficient.
I'd suspect the PWM on NiteRider's digital lights is logic-level FET
implementation (or maybe a good Darlington). This means the PWM switch
probably burns between 50 and 250mW, compared to the bulb's 6--15W, so
the power cost of having the switch in place is essentially negligible.
If you don't believe me, ask folks about the lights' actual run times;
they're ususally quite close to what NiteRider quotes---and those run
times decrease like the inverse of the bulb wattage; essentially what
you'd expect from a system that's ~100% efficient in delivering energy
to the bulb.
That having been said, I'm well aware a 15W bulb runs at less than ideal
temperatures when fed 6W, but I'm too lazy to dig up my thermodynamics
text and run through the blackbody analysis. How much visible-light
radiation efficiency is actually lost for a power drop factor of 2.5?
Based on what I've seen with my DP6, it can't be all that much. If you
call 15W 100% efficiency, 10W is probably 80%, and 6W around 65% (e.g.
a little under 4W worth of visible light, though it tends to look like
less unless your eyes are dark adapted; hard to get when riding in
traffic)---still within hailing distance of most low-cost switching and
regulating power supplies (and if NR's implementation isn't a budget
version, I don't know what is).
On the other hand, NiteRider's so-called smart charger is a joke, no
matter how much they try to squirm off the hook.
If I wanted spam from idiots, I'd post with an email address an idiot