I need to mount a single LED with sufficient heat sinking into the base of an E10 Edison screw thread bulb.
I've collected some lovely French lamps. Historically, these would be powered by a bottle dynamo. My intention is to power them using one of the... um... 10 or so hub dynamos that I own. Old incandescent bulbs don't light up much so a LED upgrade is in order. Experience has taught me that commercially available LED E10 Edison bulb upgrades are OK, but I think I can do better, especially with the selection of high power LEDs now available. Power LEDs get hot, so whatever retrofit I come up with will need to be able to deal sufficiently with the heat.
 |
| Late night scrawlings |
Thus far, I think I have an idea involving a turned copper pillar of some sort that can be pressed/epoxied into an E10 bulb base. Something like this:
 |
| Copper pillar LED heat sink |
 |
| MES/E10 lamp base |
There are several elaborate methods described for doing this. Lambda Lights seem to have mounting LEDs directly to a large copper heat sink down to a science, so I might contact them before attempting to reinvent the wheel. From what I can tell, they turn a copper pillar and then machine a square nub on the top where a PCB is mounted with a slot milled in it so the nub can poke through and be soldered directly to the thermal pad of the LED. Something like this:
While ideal, this solution may be cost prohibitive...
3 comments:
I've been looking into this concept for retrofitting Sturmey-Archer lamps, driven by S-A DynoHubs. I have found a company that makes e10 based bulbs that might be suitable: http://www.dosoe.net/skin/deshun/images/pdf/1.pdf. If the LED has good thermal connection to the base, a metal lamp should be able to conduct enough heat away. Of course, S-A DynoHubs put out AC, which needs to be rectified to produce DC required for the LED lamp.
Yeah, I've tried a few of those E10 based LEDs and they don't put out enough light for my purposes, which is the whole point of developing a custom solution. They also have built in drivers which complicate standlight design. I am, however, intrigued by the E10 bulbs described here. They have a built in standlight. The format seems impossible to allow for a very bright standlight and no measure of output is given, but it is an impressive technical feat to fit all of that into such a small package.
I like the taillight bulb design. The standlight feature is probably a supercap, which is another idea I've been playing with. I know what you mean about the headlight LED output requirement. I will try to get a sample from DOSOE of their 1 W bulb and test it. They are in China an are on holiday until early February. I'll post a message with the results if I can get one. The nice thing about the S-A headlamps is the size, which has lots of space for prototype electronics.
Post a Comment