when approaching signals, please slow down. my friend once said its ok as long as u don't exceed 80 khp- correct.
But look, what if the signals change when u are about to cross. Do u still have enough time to decide whether to stop or proceed? Driving means awareness. Its ok to maintain 80 kph as long as the signal just turn green and you are near the intersection. But when u are far out, chances are the signal will turn red anytime so beware.

Regarding your query, am sure you did not get the flash but its a close call am sure. Hope for the best.