My headlamp burned out Monday morning just as I was about to leave for work. I have to leave by 6:00 am, since it takes 1 1/2 hours to bike to work, stow the bike and change clothes. Since the sky doesn't begin to get light until after 6:30, I couldn't wait and then leave. So, another driving day to work. My local LBS didn't have a bulb in stock, but I ordered one.
Here's my NiteRider light...

Monday night I discovered that a cheaper 10 watt, 6 volt halogen bulb fits my lamp base really well. Except it wobbled in the base because the reflector isn't as deep as the original.
Original on left, cheapo bulb on right. Notice, the cheapo bulb doesn't have a lens over the bulb.

I used the cheapo bulb until the proper replacement came in on Wednesday. The cheapo was just as bright, but since it wobbled in the base as I rode, the light flickered when I hit bumps in the road. I really got worried when I approached intersections with cars stopped and waiting to cross. I wasn't sure if they fully saw me coming. Desparately I tried to fiddle with the lamp as I approached the intersections, but the light kept flickering anyway.
The replacement bulb works great and I don't have to worry about the flickering issue anymore. I did toss the cheapo bulb in my rack trunk, along with an allen wrench in case the new bulb burns out, I can use that until I get another replacement. Yes, I'm a saver. I had to really cram the spare bulb into the trunk. Some day I'll have to clean that out...
Not tonight.
On the travel front, Alex and I are headed to Door County, Wisconsin, to spend the weekend biking. Looks like it's going to be a great weekend weather-wise.
Happy riding!