That's a pretty good price for that kit. Very clever adding the connector to the bulb. No soldering required!

I'm no electrical engineer and I'm not sure what the inherent risks might be so take this with a grain of salt. When I was building my vpin, I had some buttons that needed 12v and some that needed 6v and I didn't want to run two different wires. A friend suggested using Zener diodes on the 6v buttons to step down the voltage. If I recall correctly, I simple soldered them inline with the wire. It dropped the voltage down to 5v at the button but they look fine. He indicated that the diode might get a bit warm to the touch but nowhere close to anything dangerous. This solution seems to be working perfectly for me. I figure it would pretty easy for Ryan to include one set of wires for each bulb with the Zener diode and one without. Or make that an option when you order.

If there are any concerns here, I'd love to hear about it.