Our Theta light illuminates forwards and downwards, providing both focused light and a great field of visibility. Featuring an auto light sensor, quick release and battery level display, Theta is a great partner on the road!


Night cyclists need both focused light so they can see obstacles in the road and a wide field of illumination so that they too, can be seen. GUEE provides a solution which achieves both optimal brightness and light distribution. The beam is focused from the front wheel out to 10 meters in front of the bicycle, as well as being distributed in a wide arc for better visibility. A re-chargable LED light, Theta features a smart auto sensor which adjusts the light output depending on ambient light conditions. The battery can be charged via micro USB and has a 4-level battery indicator. An easy quick-release buckle lets you take your Theta with you whenever you leave your bike.


  • Forward light from the front wheel out to 50 meters
  • Downward light distributed in a wide arc in front of the wheel: easy to see the road conditions
  • Cut-off line beam designed to avoid dazzling oncoming traffic
  • Provides manual & automode function (auto adjustment of light output depending on ambient light and conditions) 
  • Built in, easy to use, rechargeable battery with USB charging port
  • Power indicator showing 4 levels 


  • Light source:CREE LED
  • Modes:Auto & Manual (Standard / High / Low)
  • Battery:Li-Poly rechargeable battery 1000mAh
  • Charge:Micro USB charge port
  • Strap Mount:Ø22.2mm / 31.8 mm
  • Water Resistant:YES/ IPX5
  • Color:Black / White
  • Charge time:3 hours (approx)
  • Burn time (approx):2.7hrs(high)/5hrs(standard)/8hrs(low)
  • Size (L x W x H):73 x 45 x 30.5mm
  • Weight:50g w/o bracket