My take is that 110 lumens is produced by the LED (maybe optimistically) if given "full power" according to nominal design of the system or a "characterizing current" of the LED (or worse still is maximum available from the LED) when the LED is cooled to having either its heatsinkable surface or the hottest part of its semiconductor chip at 25 degrees C (77 degrees F).
(Thankfully, the Seoul Semiconductor LED that I consider most likely to put in a bicycle headlight has its "upper grade" version supposedly producing minimum of 100 lumens at 350 milliamps IIRC - very good actually.)
Lumens produced by the LED do not all make it out of the lighting unit. Reflectors are not perfectively reflective, and absorb some of the light. Lenses reflect some of the light backwards, and the light reflected backwards by a lens is usually mostly either absorbed or ending up going somewhere other than where you want the light.
Maybe this bicycle light, shone upwards at a ceiling painted with brightest white paint, will illuminate a room as well as a 110 lumen lightbulb (typical of many 15 watt 120V ones) does. But I would not count on that, not even from a $129 bicycle headlight - even though it would kick kiesters and tookuses as far as bicicle headlights go if 75 lumens usually came out from it.
- Don Klipstein ( snipped-for-privacy@misty.com)