Originally Posted by Daily Commute
[URL="http://www.bikeforums.net/showthread.php?t=186389"]
Sixth, DIY is an investment in future bike equipment. You really do learn stuff by DIY, which can save you money over your decades of riding. My solders may not be as good now, but they're getting better. And if I want to be adventurous, I should be able to connect up rear LED's to my battery. That would give me a $60 Niterider-like rear light for a fraction of the price.
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I am a DIY guy myself. There's nothing better than the smell of a hot soldering iron! I don't know what voltage your running with your light but if it's a 12-volt system you might consider the 13 LED Utility, Auxiliary, Turn Signal & Brake Lights at the bottom of the page at the following link.
http://autolumination.com/bike.htm
This provides a nice and bright taillight as well as an extra bright stoplight. It's not hard to hook a switch on a brake cable for automatic operation of the brake light and it's oh so cool! It could keep you from getting run over by a drafter as well. They have LED flasher cans so you can have a steady tail light and extra bright flashing brake light.
They have standard blinkie lights as well that wire into a 12-volt battery and blinkie lights with internal batteries. My personnel preference is to use batteries in a bag for the headlight and blinkie lights with there own batteries so if something happens to the headlight battery you still have the other blinkie lights so you can still be seen.