Freako, Michel
Here are the wall photos, Canon EOS 300D , 1/25th second shutter, F5.6 apeture. The must analysed relative to each other, in practice they are much brighter.
Knog Frog
BLT Super Doppler
Cateye TL-LD1000
PB Superflash
Dinotte Tail light - low power
Dinotte Tail light - medium
Dinotte Tail light - High
All together, from L to R, cateye, BLT, Superflash, Dinotte (low), Knog is in front