-Is lightweight.. A 455 gram light adds one pound, so like to keep the light(s) less than that.
-Has no wires to an external battery-especially for the helmet.
-A helmet light that will add depth of field, a backup light, and something to use in case I have to change a flat.
-Has a run time of minimally 3 hours. I'm not planning to ride thought the night, but if I leave in the dark 45 minutes before sunup--a 2 hour run time light has me nervous for later.
-Has LED bulb(s) so I don't have to worry about replacing the bulb and I get a white light (instead of yellow.)
-Gives off enough light. On roads with no street lights-15 watts/ 110 lumens is too dark.
-Is inexpensive-though lights are not getting cheeper (sic)--but brighter and smaller.
Every year lights get more powerful, smaller, longer lasting (thanks to LEDs.) With my eye toward the Alta Alpina 8 next year--and 2 hours of night mountain riding, I started considering a new bike light. My 65 lumens Coast mini flashlight (100 hours) and 50 lumens Princeton Tec Headlamp (105 grams, 4.5 hours) didn't cut it at the beginning of Knoxville, especially when there were no streetlights. And my NiteRider MiNewt, at 110 lumens, (175 grams, 3 hours) barely did the trick at the end when on a streetlamp-less country road. Something more was needed riding down a mountain pass.
I also have an older15 watt* NiteRider Smart Evolution Halogen light (*lights used to be rated by watts and NiteRider has not converted this to the more precised lumens.) But three problems. (1) Though it could be stepped down to 10 watts and last longer, at 15 watts the light only lasted for 1:45 hours. (2) And it weights--550 grams, adding over 1 pound. (3) Even 15 watts isn't that bright when there is no other surrounds light.
Exposure Lights caught my eye. All their lights last 3 hours on high. Their lights are relatively light--their 960 lumens light is just 298 grams and their helmet mounted Joystick, 240 lumens, is a flyweight 76 grams. At first I figured that I'd get an Exposure Light for my bike and use my NiteRider MiNewt as a helmet light. But then I'd be riding around with a wire dangling from the helmet light to the battery taking up space in the jersey.
An alternative came to mind as Exposure Lights have NO WIRES. I'd picked up the Exposure Joystick to evaluate their product, use it as a helmet light, and if I like it I'd eventually pick up one of its big brothers.
First helmet 10' away from light, 2nd helmet 20' away, Flanders Flag 25' away. (Photos taken on tripod at 1/2s 3.1f) Note-Ward did recommend that I shine each lighting system at annoying corner neighbor's house and see which one they come running out about the fastest.
Coast Mini Flashlight (65 lumens) coupled with Princeton-tec (50 lumens) headlight not the greatest--even if they give off more light than most small bike lights. (And in a garage you get reflection off the walls, ceiling floors; and the light just has to throw 25' which is barely acceptable outside (at 20 mph you'll travel almost 30' a second.)
MiNewt on low puts out a nice white light& 15w halogen Evolution puts out a more diffuse light but yellow so not a great throw forward. Joystick on has the least spread--but has a nice clean spotlight.
I'll have to make the helmet a tad tighter, it seemed to slip forward a little with the light.
Outdoor Test #2
As you can see below, the MiNewt's 110 lumens lights up the can hazard, but really fades to the 1st pumpkin on the road, and this area is not that bright. The 15wEvolution really brightens up the can hazard, but really doesn't light up much else--though if I had time to look at the photos at the site I'd have redone this one pointing the light further out.