If your funds are limited but you still want to ride safely, consider picking up the surprisingly well-built and bright
TeamObsidian Bike Light Set.
One of the benefits you sacrifice with the low cost of the TeamObsidian Bike Light Set is usability out of the box. Batteries aren't included. Despite having to buy 5 AAA batteries (I recommend getting rechargeables), there is a lot to like about this set.
The headlamp produces 200 lumens of light. Both lights have three lighting modes — high, dimmed, and flashing — and are designed to withstand water, snow, heat, and dust. Installation is effortless and tool-free. And, the lights have quick-release mounts so you can take them with you and avoid potential thefts.
TeamObsidian stands behind the quality of their bike lights by offering a "100% no-hassle lifetime guarantee." The company specifically states that they will refund your money if you are dissatisfied for any reason. And, if the lights break, they will send you new ones.
WOM-derful recommends the TeamObsidian Bike Light Set because of the powerful headlights with adjustable beam patterns and lack of dead spots. However, she felt the tail lamp wasn't sturdy, was hard to open, and wasn't impressed with the brightness or beam patterns. Outside Pursuits recommends this light for country roads and urban riding but notes that it isn't designed for trails.
More than 1,100 buyers have left positive reviews of the TeamObsidian Bike Light Set on Amazon. The most helpful reviewer, Joseph Wolschon, had tried a number of bike lights in this price range and preferred this model. He found the metal build quality was better, the light detaches easily and can be used as a flashlight, and he was impressed with the customer service.
There are several other stories of how good the customer support is. Other common positives are that the lights are quite bright and the mounts, though they are made of thin plastic, hold the lights solidly.
Pros: Affordable, adjustable beam width, excellent customer service, impressive lifetime guarantee
Cons: Doesn't come with batteries, not designed for trail riding
Buy the TeamObsidian Bike Light Set on Amazon for $15.99