Which bike light, aren't that to be seen kind enought?
So you're riding at night - are the routes lit by streetlights?  Or are you riding in pitch darkness?
The former would recommend two &quot;be seen&quot; lights for the front and two for the rear, and the latter would require at least one Seeing light and a backup for the front and still two on the rear.
I'd strongly recommend adding some combination of spoke reflectors, reflective sidewalls, and reflective clothing to go along with your active lighting.   DOT tape is available in appropriate colours and costs nothing to operate.
Be aware you do not need a Giant-brand of light on your Giant branded bike.  The only time such a thing is needed is if there are built in connectors to an internal wiring harness or similar.  Otherwise you're free to fit whatever lights you like.
I personally run two completely different front lights plus a head lamp.  The main one has an &quot;hours remaining&quot; readout which tells me if I can make it home before it goes flat.  Likewise I have several rear lights each with their own power, so they're less likely to all go out at once.