GIRO Rear Light GIRO ROC LOC 5 LED BLK 22

Very bright light. Fits over the Giro roc loc helmet adjustment knob and has a very iffy securing method with just two small hooks on the upper side. It had an obvious fixing position but the slightest knock and it fell off. I thought it was secure once my helmet was on but on my second ride home I took my helmet off only to find it was not there, fallen off somewhere on the ride. Useless and a total waste of money.

I didn't purchase on Amazon, so no verified purchase. I got this light with the Helios Spherical helmet I purchased. As stated by other reviewers, you need the Roc Loc 5 attachment system on your helmet to accommodate this light. This light attaches firmly to the rear of my helmet, but I'll probably heed the advice of others and leave it attached to the helmet, as opposed to removing it to charge, due to the stiffness of the connectors that hold it in place.This light has, IMHO, a very high lumen output, stating 20 lumens on steady light and 30 lumens on flash, so you'll definitely be seen on sunny days. I use this light as my backup or emergency light if my Moon Sirius bike light fails or there is really bad weather.Legal stuff according to UK bike laws.I'm guessing the flash cycle is approx. 4 HZ (4 flashes per second) or 240 flashes per minute, which is the highest end of the legal limit according to UK bike law. A slower flash cycle would have been nice, as I'm not sure how a fast flashing light with such intensity affects those behind me. According to UK law, your rear light should be attached to your bike and be no higher than 35cm and 150cm from the ground, stating possible legal implications of using a helmet light only and having an accident.