I bought this six pack of 9.8 ft strings of 30 super bright micro LEDs and will be adding them to an outfit, wrapped around my bike, etc. They're pretty bright and use a simple coin battery. I'll keep extra batteries around. They're not going to withstand the wash, so I'll have to dismantle the outfit and repurpose for the next season. Price is right for me for the purpose.

Always on the lookout for brighter & more durable and more options, though.