A new train headlight design uses two half-circular parabolic, or cup-shaped, aluminized reflectors with high-efficiency LEDs placed in the plane where the two reflectors come together.

Conventional headlamp design causes light output to decrease over time, often starting as soon as you press the power button.

So, read on below for the best headlamps on the market today. Best for astro We love the BioLite HeadLamp 425 for two reasons: one, it's excellent value for money and two, its battery (i.e. the ...