Ticket to Ride; LED Bike Light

November 29th, 2008
bikes, games
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.
Referenced in:

Comment via: facebook, substack

Recent posts on blogs I like:

Parenting standards and the village

Cartoons Hate Her has written about the village nobody wants. In principle, parents usually want a community to help take care of their kids: someone to bring meals when they get sick, keep an eye on their children while they play, and talk to about paren…

via Thing of Things December 19, 2025

Opinionated takes on parenting

This post is a collection of parenting takes that sometimes go through my head, based on my experience raising our two boys (5 and 2 years old). All of this is based on my experience and might not apply to others (see the law of equal and opposite advice)…

via Victoria Krakovna December 16, 2025

How to Make a Christmas Wreath

Yesterday, I made a Christmas wreath. Here's how to make one. First, find an evergreen tree near your house. Clip off a few branches from the tree. Try to have as many leaves or needles on the branches as possible. Next, bring them home. What I usu…

via Anna Wise's Blog Posts December 6, 2025

more     (via openring)