If $50 is the definition of cheap in this thread, whats the definition of good, effective and bright?

There are several evolutions of bike lamps:

1. flashlight body with mount for use on handlebar
2. offroad mtb lamp with round shaped reflector and low luminous flux (<200lm)
3. offroad mtb lamp with round shaped reflector and medium luminous flux (200 - <900lm)
4. offroad mtb lamp with round shaped reflector and high luminous flux (900 - 4500lm) examples: YinDing, Lupine
5. bicycle lamp with reflector optics/cut-off beam and low illuminance (<40lx) examples: B&M Ixon, Cateye HL-EL500
6. bicycle lamp with reflector optics/cut-off beam and medium illuminance (50-100lx) examples: B&M Ixon IQ Premium, Cateye Volt 80
7. bicycle lamp with reflector optics/dual beam and high illuminance (150-380lx) examples: B&M Ixon Space, Supernova M99 series

The difference between headlamp and headlight can be told as follows:
"headlamp is the term for the device itself, while headlight properly refers to the beam of light produced and distributed by the device"
wikipedia.org/wiki/Headlamp

So for class 5/6 there are now even chinese designed lamps without brand:
banggood.com/XANES-SFL04-750LM-T6-LED-German-Standard-Smart-Induction-Bicycle-Light-IPX4-USB-Rechargeable-Large-F-p-1217023.html
banggood.com/XANES-1500-Lumens-Led-Bicycle-Lights-MTB-Cycling-Front-Head-Lamps-Safety-Usb-Charge-Cycling-Light-p-1216450.html