Early in the year, someone started a strobe discussion in chat. I thought about making them as a double sided PCB with 5050 white LEDs. See, I wanted my strobes to emit light from all around if possible. I had planned to use a WS2801 (or similar) chip in each strobe and there should be plenty of cool white 5050 package LEDs to choose from. The PCB would slide into a short clear tube, with wires coming out of each end. The tube is easy enough, but the problem was how to seal the wire entries. So the idea languished while I worked on other project designs... Then, while talking to Josh (ChillOutDocDoc) this morning in chat, I had an idea! We could use small cable grommets with an OD the same as the tube's ID. We could add the wires to the PCB, slip the grommet over the wires and press it into the tube ends, leaving a few mm of open tube. Then, the end would be sealed with silicone (or hot melt glue?) and the grommet would stop it from bleeding too far into the tube. Here's a diagram to explain better. Once the details were worked out, it could be done as an ACL DIY project.