Lupine Betty R12 3600 lumen bike/headlight.

I know it’s not a budget light…. well… at all, but I was curious how they are getting 3600 lumens out of such a small package?

http://www.bike24.com/p238391.html

Not that I would every buy a light that’s so pricy. :stuck_out_tongue:

11.1ah x 3.7 volts gives 41 watt/hrs, but it claims 2 hours of battery life at 40 watt output, so something is very wrong.
my bright car headlights are about 900 lumens each, so you don’t need 3600 lumens to light a trail, but their numbers don’t add up, plus almost 40W of heat would be hard to dissipate on something that size

Lupine makes some of the best and arguably most over-priced bike lights out there. But they are honest:

http://reviews.mtbr.com/lupine-betty-r-12-2013-mtbr-lights-shootout

Overheating is usually not a problem on a moving bike.

Fair enough on a moving bike, but the lumens do fall pretty quickly by a fair amount, and still no explanation how they get 40 watt output for 2 hours on a 41 watt/hr battery

Did you read the review? Looking at the runtime graph, I wouldn't call that a pretty quick drop off in lumens. Besides, no one is going to run 3600 lumens continuously for an entire ride.

Why do you require an explanation of how they get the output they do? Dem German engineers are pretty crafty! Could 2S2P configuration affect your calculation?

hmm… they’re not using CREE XML T6?

link to web page says battery is 7.2v which is just over 80wh.

Lupine was the reason I got into making my own. Just couldn’t see parting with Nine Benjamin’s for something I could make for one.

make me one too for the price of sky ray king? :smiley:

For that kind of bucks, Betty better put out a lot more than just lumens… J)

that explains it then

I have 1/2 dozen complete sets(lights, batteries, chargers, cables, mounts, switches) of nightstick kits with the stock halogens sitting around waiting for I don’t know what. Up till now all of the mods I’ve done on them have been multi emitter jobs(3x xre, quad xpg, etc) because 35 mm optics are shorter for these than for single emitters. Seems like many members prefer to just use a hand light with a two fish block and I can’t say they’re wrong to do so. I just prefer the runtime and weight placement of a dedicated bike light.

I agree with you, i prefer a charge it and use it with no fuss bike light as well, but at this price i could buy a new bike, light and maybe even an electric bike.
When i can afford it i am thinking of getting the $50ish 800 lumen bike light from intl outdoor.

It would be nice to spend $50 and be done with it but I haven’t heard great things about the cords and switches on those inexpensive models. My lights aren’t as pretty but they’re way less than Lupine, made with quality parts, and BLAZE . I’m only now as I get more into handheld lights moving into lithium cells but given the cord lengths involved I want to learn more about series packs with balancing circuits to avoid high current losses and switch problems before I go to liion for the bike. I’d like to do it soon though because nimh’s are just plain heavy!