if you are travelling fast on your bike you will need a brighter head lights. And the duration of the burn should be longer than your night time riding duration. Common sense.
The cost of the light is dependent on the wattage (brightness) and burn time. Also weight is big to do. Older model used NiCad then are heavy. NiMh (nickel metal hydride) is lighter and smaller but tad more expensive. A high end model will use (Li-ion) batteries very expensive, very light and even smaller. Li-ion is for those "money is no object for weight saving"
The cheap model do not have multiple brightness setting nor do they have the ability to focus the light or disperse the light for better side view.
I don't want to spend $300 for a high end and if I could find one at around $150 I would find that a reasonable compromise. I think you can still find a good usable lights for less than $100.
And mount a fast flashing red LED tail light. Another helpful thing to get noticed is to strap a small flashlight on your left leg and point it upward. The up & down and forward/backward movement of the light makes you far more visible to a car driver.
smilingcat



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