Knog Frog V3 Rechargeable Front Light


The rebirth of an iconic bicycle light, the Knog Frog Front Bike Light is bright, versatile and fun. A design that millions of riders around the world have come to love. With a 40 lumen output they are best used to complement an existing lighting set-up. The Frog lights are quick to attach and make a great backup light, or emergency light.

Taking cues from Knog’s more advanced lights, the Frog is designed with Chip on Board LED technology, enabling a high intensity light that's compact, low profile and packed with features


  • Punchy 40 lumen output
  • COB LED Technology - Efficient Chip on Board (COB) LEDs provide maximum brightness level for up to 90% of the battery burn time
  • Advanced Side Visibility - COB technology allows the LEDs to be arranged on a curved board, projecting light from the sides & adding to rider safety
  • One Button Operation - A single large, easy press button makes the operation of these lights super simple, even in gloves
  • Integrated Flexible Mounting System - With no tools required to mount Frog and featuring an integrated flexible strap, Frog is easily mounted anywhere


  • Bulb Type - Chip on Board (COB) LEDs
  • Light Max Output - 40 lumens
  • Run Time - Up to 80 hours
  • Programmable With ModeMaker - No
  • Waterproof - Yes, IP65 rating
  • Light Modes - 9
  • Rechargeable - Yes, USB-C
  • Low Battery Indicator - Yes
  • Fits Handle Bars - 22 - 32mm+ diameter, plus head tubes to 7.9 inches
  • Dimensions - H: 80 mm x W: 35 mm x L: 42 mm
  • Weight - 20 grams
  • Operating Temperature - -20 to 50 °C / -4 to 122 °F
  • Strap Material - Medical grade silicone
  • Optimum Charging Temperature - 20 to 22 °C / 68 to 72 °F (Room Temperature)
  • Colour Green

Output 40 Lumen

Position Front

Power Source Rechargeable Battery

Bike Lights - How Many Lumen Do You Need?

Bike lights are rated in Lumens. A Lumen is the measurement of the total visible light emitted and is commonly used for all kinds of bulbs.

One thing worth noting is that most lights advertise their headline rate. Packaging may say 1000 lumens. Reading the small print they might only do that for an hour. That light may run 500 or 600 lumens for 2 or 3 hours. So it's worth buying a light with more lumens than you need to get decent running times.

There is no fixed agreement on how many Lumens you need for a bike light as it depends on the type of cycling you are doing. As a rough guide we say that:

  • Daytime running lights = 100+ Lumens
  • Urban commuting lights = 50 to 200 Lumens
  • Rural riding lights = 400 to 600 Lumens
  • Trail riding lights = 600+ Lumens

Price Match at Cycles uk

We understand that price is important, so we regularly price-check our competitors to make sure we have the best offers available. We recognise that we will not always be the cheapest, so if you see the same product cheaper from any of our competitors then please get in touch via the form below and we will do our best to match any reasonable advertised price.

Colours Abyss Grey, Aqua, Army Jacket Green, New Denim Blue, Spider Black, Tequila Sunrise
Brand Knog
Model Year 2022
Barcodes 9328389031394, 9328389031400, 9328389031417, 9328389031424, 9328389031431, 9328389031448
SKUs / Part Numbers 13090, KNG13090, KNG13091, KNG13092, KNG13093, KNG13094, KNG13095

Please note: Manufacturers can sometimes change the specification of the products from time to time.

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