• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Ticket to Ride; LED Bike Light

    November 29th, 2008
    bikes, gaming  [html]
    Thanksgiving was nice, but sort of strange. Alice, Rose, and Danner came from Western Mass; Anne, Lee, and Meghan came from Philly. No same-age cousins, though. Calmer than usual, and a little less fun without Stevie, Susanna, and Claire. But still fun.

    We played a lot of the Train Game, and I tried a 'rush' strategy where I ignored all route tickets and just went for the six train fifteen point routes that would use up my trains really fast. I also took routes when it would make someone else take a costly detour. The goal was to finish the game when lots of people would have routes unfinished and couting against them. It worked, and everyone was mad at me. A bit disruptive.

    I finished up the light for my bike. I ordered a Cree XR-E (R2 bin, WH tint, about 115 lumens ar 350mA) from Cutter along with a 10 degree / 40 degree elliptical lens with holder at 90% efficiency. I'm running it off my new Sturmey Archer X-FDD hub dynamo (6V at 3W). I put the LED in the place of the incandescent bulb in the chrome bullet headlight that came with my bike. Pictures:

    That copper mass under the light? Heatsinking. The light is only about 15% efficient, so the rest of the 3W is heat. Unlike a bulb, that makes the led unhappy. So I have the LED mounted on an aluminium star, that soldered to 12 gauge copper wire, that running through a notch cut in the bottom of the light enclosure and soldered to a beautifully twisted copper marvel (rats nest) to maximize heat transfer with the air.

    Comment via: facebook

    Recent posts on blogs I like:

    More on the Deutschlandtakt

    The Deutschlandtakt plans are out now. They cover investment through 2040, but even beforehand, there’s a plan for something like a national integrated timetable by 2030, with trains connecting the major cities every 30 minutes rather than hourly. But the…

    via Pedestrian Observations July 1, 2020

    How do cars fare in crash tests they're not specifically optimized for?

    Any time you have a benchmark that gets taken seriously, some people will start gaming the benchmark. Some famous examples in computing are the CPU benchmark specfp and video game benchmarks. With specfp, Sun managed to increase its score on 179.art (a su…

    via Posts on Dan Luu June 30, 2020

    Quick note on the name of this blog

    When I was 21 a friend introduced me to a volume of poems by the 14th-century Persian poet Hafiz, translated by Daniel Ladinsky. I loved them, and eventually named this blog for one of my favorite ones. At some point I read more and found that Ladinsky’s …

    via The whole sky June 21, 2020

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact