Found a pretty cheap bike light. Seems like a popular and highly reviewed product on Banggood.
Projects light up to 50-100metres. Waterproof with IPX5 resistance. 1200mah rechargeable battery.
5 different modes
1 - Smart Sensor Mode
2 - Red Light
3 - Power Saving Light + Day Light (400LM)
4 - Strong Light + Day Light (600LM)
5 - Slow Flash
Features
- Light sensor - ambient light darker, stronger light lighting.
- Shock sensor - when light turn off, go on riding, the light will turn on,if you forget to turn off the light,after 3 minuters,it will be turn off itself.
- Power save - aurora mode can be used continuously for 2 hours and power saving mode Release 6 hours.
- Safety - no glare, accident prevention.
- USB charging - easy to use.
- Easy to install - anti-fall protection.
- Recommended use for night riding, mountain bike, fixed gear bike and so on
Title price includes GST and shipping. AU price based on current mastercard conversion rate.
[Xanes rear light]
(https://au-m.banggood.com/XANES-2-in-1-500LM-Bicycle-USB-Rec…)
seems to be a good deal too?