Bike lighting: how many lumens and how to choose well

Good lighting is both being seen (safety) and seeing (on unlit roads). The marketing trap is the race for lumens: more is not always better, and poorly chosen, a light blinds without illuminating. Here are the real criteria.

How many lumens depending on use

• Being seen in lit city : 50-200 lumens front, a good flashing rear light is enough.
• Seeing on unlit road/trail : 400-800 lumens, with a beam that carries far.
• Night MTB / high speed : 800-1500+ lumens, ideally a road optic to avoid glare.

Beyond that, you're mainly paying for battery consumed. Beam quality (sharp cutoff, reach) matters more than the raw number.

Battery life and charging

Check battery life at the mode you'll actually use (often medium mode, not eco announced). USB rechargeable is the norm; keep a battery-powered backup light as backup. A battery indicator prevents running out mid-trip.

Fixed or removable, and the rear

• Removable : practical against theft, easy to reattach.
• Integrated/dynamo : zero recharge, ideal commuter (always ready).
• Rear : red light visible + possibly a flashing mode. Lights with braking detection gain safety.

Approval (depending on country)

Some countries require approved lighting (no front flashing, regulated intensity and reflectors). For strict road use, check local compliance; for MTB, power comes first.

Our recommendation

• City commute : 100-300 lm front + rear light with braking detection, USB.
• Unlit routes : 600-800 lm with road beam + powerful rear.
• Always : a backup light.

For an e-bike with integrated lighting on battery or doubt about power, the L'Atelier assistant helps you make the right choice.