My Dinotte style Blinkie.

Size comparison with PB SF, sorry for the crappy photo.
The led does get hot, thus I used an aluminum plate that was for scraps.


I should have spent more time making it neat, but oh well, it took me about 30 minutes to make this.

PB SF on the left, my DIY on the right on high mode. On low mode, it is just as bright as the SF but with a really wide beam.

The beam's hotspot and flood is very very wide.


Cost:
Cree XR Red led, $5
5-mode driver (10Hz flashing, SOS, high, medium, low), $3.10
30° Lens for LUXIII, drilled and sanded to fit Cree, $1.40
Clicky switch, $0.30
I got all of the above from kaidomain.com
+ miscellaneous (wires, solder, silicone sealant, nuts, screws, presta valve thread nuts (from punctured tires))
Total: $10 + old parts

The case is from an old Vistalite, I tried to fit the LED inside the casing, but the led got really hot.

Edit: more info added

The light mounts on a standard Planet bike mount for the BRT3, BRT7, and the SF, I use this mount because I have this mount on all of my bikes. I was a SF fanboy (I currently own 3 SF), but not anymore, this thing has +180° visibility when flashing because the lens is not covered, PBSF is a joke compared to this monster.

It takes 2 AA, I have no idea what the run time will be, so I'll be testing this light tomorrow night. I will be running this light flashing while PBSF will be on steady.