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:

Avoiding being raped

A comment on a recent blog post asked for advice for a trans woman who kept making dangerous dating and sex choices, because she hadn’t received the female socialization that would have taught her to avoid threatening people and risky situations.

via Thing of Things October 28, 2026

“We should be more ambitious with the software we build”

Since early this year, Michael Malis (of pgrust) has been showing me interesting things he's done and saying [W]e should be more ambitious1 with the software we build There is, understandably, a lot of skepticism about projects like pgrust because there…

via Posts on October 24, 2026

Was the HuggingFace hacking incident scheming?

In July 2026, internal OpenAI agents hacked HuggingFace (HF) in order to figure out how their evaluation grader works. This involved a thousand agents coordinating on an improvised message board to carry out an elaborate sequence of exploits. A later grou…

via Victoria Krakovna October 18, 2026

more     (via openring)