Step 1: Helmets Are Good, They Add Protection But Little Preventative Measures. .
Step 2: Reflective Tape Is Good in Daylight and Night Time and Because Your Head Moves When You Ride It Catches Drivers Attention
Step 3: LED Side Lights.
I've used 4x3v CR2033 "button cell" batteries. these are mounted in a small cardboard tube and water proofed with a cut up wheel inner tube. they are then strapped to the outside top of the helmet with cable ties. I haven't installed a switch so I'm just twiddling together the wire to turn it on and taking it apart to turn it off.
I'll go out and buy a switch tomorrow.