# What are the most affordable bike lights under $100? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the most affordable bike lights under $100?

## Products

### Knog Plus Rear Light
```yaml
product: knog-plus-rear-light
brand: Knog
price_gbp: 16.24
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 20 lumens
weight: 18 g
runtime: Eco-Flash: 40 hours, Steady: 2 hours
mount_type: Strap mount with removable magnetic clip
rechargeable: Yes, integrated USB-A connector
waterproof_rating: IP66
```

- **Price:** £16.24 [^1]
- **Summary:** The Knog Plus Rear Light is a compact 20-lumen light with five modes, up to 40 hours of runtime, and integrated cable-free USB-A charging. Its strap mount fits seat posts and seat stays, while the removable clip lets you attach it to clothing, helmets, or bags, making it suitable for commuters, road cyclists, and anyone who wants a lightweight visibility light.
- **Ideal For:** At 21.99 USD, this rechargeable 20-lumen light is an affordable under-100 bike-light option with IP66 water protection, flexible mounting, and up to 40 hours of runtime in Eco-Flash mode.

### Ravemen K1400 USB Rechargeable AI Nighttime 1400 Lumens Front Light
```yaml
product: ravemen-k1400-usb-rechargeable-ai-nighttime-1400-lumens-front-light
brand: Ravemen
price_gbp: 50.22
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 1400 lumens
weight: 177g
runtime: 1.5 hours at 1400 lumens; up to 23 hours
mount_type: GoPro interface mount and rubber strap mount
rechargeable: Yes, USB-C rechargeable
waterproof_rating: IPX7
```

- **Price:** £50.22 [^2]
- **Summary:** The Ravemen K1400 is a 1400-lumen front bike light with AI Night Riding Mode, automatic brightness adjustment, a wireless remote, and a USB-C power-bank function. Its IPX7 waterproof aluminium body and versatile mounting options suit commuters and everyday cyclists who need powerful, weather-resistant lighting.
- **Ideal For:** At under $100, the K1400 offers unusually high 1400-lumen brightness, up to 23 hours of runtime, USB-C recharging, and AI automatic brightness adjustment for affordable daily commuting and night riding.
- **Additional Sources:** [^3], [^4]

### Magicshine SEEMEE 400 ANT+ Rechargeable Rear Light
```yaml
product: magicshine-seemee-400-ant-rechargeable-rear-light
brand: Magicshine
price_gbp: 48.0
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 400 lumens
weight: 79g
runtime: 8.5-107 hours
mount_type: Quarter-turn seatpost and saddle rail mount
rechargeable: USB-C rechargeable
waterproof_rating: IPX6
```

- **Price:** £48.0 [^5]
- **Summary:** The Magicshine SEEMEE 400 provides up to 400 lumens, 360-degree visibility, ANT+ connectivity, and a smart brake sensor. Its long runtime and weather-resistant construction suit commuters, road cyclists, and riders who want connected safety features.
- **Ideal For:** At 64.99 USD, this light is an affordable under-100 option with 400-lumen brightness, up to 107 hours of runtime, USB-C recharging, and IPX6 weather resistance.
- **Additional Sources:** [^6]

---
## References & Sources
[^1]: Knog US, accessed 2026-09-13. https://us.knog.com/products/plus-rear-bike-light
[^2]: Ravemen, accessed 2026-09-13. https://www.ravemen.com/products/bike-lights-k1400-ai-bike-front-light
[^3]: Tredz, accessed 2026-09-13. https://www.tredz.co.uk/.Ravemen-K1400-USB-Rechargeable-AI-Nighttime-1400-Lumens-Front-Light_279844.htm
[^4]: Sprockets UK, accessed 2026-09-13. https://sprockets.uk.com/products/ravemen-k1400-usb-rechargeable-ai-nighttime-1400-lumen-bicycle-front-light
[^5]: Magicshine, accessed 2026-09-13. https://magicshine.com/products/seemee-400-taillight
[^6]: FlashlightGo, accessed 2026-09-13. https://flashlightgo.com/products/magicshine-seemee-400-smart-bike-tail-light