A little stoke released from Transition Cycles.
2014 MTBR Bicycle light review and shootout. MTBR tests manufacturer lighting in their laboratory to compare performance with the company's claimed lumens (brightness). They also compare prices, weight, design and build quality and the battery performance. They tested some tail lights as well, like the Leyzne Micro Drive Rear light with 75 lumen light output which can be highly visible even in daylight hours. The Sefas True 350 lights share a housing design similar to the Cygolite Expilion 350 that I personally use on treks that wasn't tested (and it's very good). The Serfas True 350 was tested producing 420 actual lumens and has a 2 hour battery life on their $120 model. The most powerful light tested was the Dallas, Texas, USA hand built Trail Led Halo 6000 which produced 5350 lumens as tested and is priced in the high-end of the consumer bike light market at $1199. The Trail Led Halo has a 38 hour battery if running the device at 600 lumens.
Compare all models tested at MTBR Bicycle Light Reviews 2014