Righty. Between me and my lad/family....
Two Hope 1s, had at least 4 years.
Magicshine 808e
Magicshine 818 x 2 (rear)
Generic t6 clone
Triple T6 off road light
Yinding Twin U2
Solarstorm twin U2
Mini U2 with side halo x2 (winter commutes)
4 x 
Decathlon v100 USB backups
2x C&B Seen 500 rear lights (about 200 lumen)
4 x Planet X Phaart 3w front lights
3 x Planet X Phaart rear lights
Mars 3.0
Mars 4.0
4 x Smart super flash (R1)
2 x Smart R2 (version2)
1 x RSP Astrum (broke two others)
1x RSP twin led (crap and not even slightly shower proof)
And other little backup lights.
As to how much, lots.