Originally Posted by
TimothyH
I looked at the website. Not sure I care for the mount but this looks nice otherwise.
Any idea what 80 Lux would be in lumens? Is this a 200 lumen light, 500 lumen light, etc.?
Mathematically you're not going to make a meaningful conversion because lux is light per unit area, lumens is the total light, and you can't factor in beam shape - the light ending up on trees and in the air doesn't count for illuminating the road.
Subjectively it looks as bright as a Magicshine MJ808 on medium which is a claimed 900-1000 lumen light that really measures 550-650 on high and is probably 275-325 on medium with twice the run time, but you can see better with the B&M because it doesn't have a significant hotspot interfering with your night vision.
You can't tell absolute brightness from images due to cameras seeing differently than people with varying exposure times, just what the beam is shaped like. To borrow @
PaulRivers picture from his 2014 bikeforums.net thread
http://www.bikeforums.net/commuting/942351-ixon-iq-premium-bike-light-may-best-bike-light-i-ve-ever-seen-lumotec-cyo-google-page-ranking.html
Magicshine MJ-808 P7 10W LED lamp (for MTB use) compares an Edelux dynamo light measuring 180 lumen @ 30km/H to the Magicshine, although the Ixon IQ Premium shares the Edelux II optics which are 30% brighter than the original
The high beam gives the impression of a lot more light than an Edelux, but as I wrote elsewhere, about 0.6 to 0.7 of the beam gets onto the road. This means about 330 to 385 lumen get onto the road, around twice as much as an Edelux. But it looks much brighter because of the brightly lit up area just ahead of the front wheel, and the hotspot. If I aim the hotspot far away so that I get good light on the road up to about 40 metre, then the area on the road is lit up about as well as with an Edelux, it's just that the Magicshine's beam is broader, and more uneven (bright bit, then darker, then the hotspot). The broad beam that also illuminates upwards (trees on the side of the road for example) gives you more the impression of riding in daylight...