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[ All credit for this answer goes to nhinkle, hence the community wiki ] In this specific case, it's actually fairly easy. The light which you've linked to, the Smart Lunar 35 lux, is actually just a rebranded Planet Bike Blaze 2W Micro which has a claimed 139 lumens. (A number of Smart products are actually just rebranded from other manufacturers, ...


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Best bet is to look at them - if you can't do it in person, look for reviews with pictures of the beam and illumination. For example, road.cc have a comparison tool. I couldn't immediately see anything putting 35 lux in the centre, where I assume yours is measured. The Topeak Whitelite HP Beamer (who names these things?) is closeish at about 30 lux, so ...


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That is an inexpensive light that runs on 2 AA batteries. And has a narrow beam. Rather than focus on getting something just a "little" brighter if you want to stay cheap just buy a second AA light and use both. Or get a second of the same. Or step up to more expensive rechargeable lithium ion light. It will be brighter. Focus on reviews.


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I don't think you're going to be able to do any reasonable conversion, since lux without a distance is meaningless. It's likely that the manufacturer has picked lux specifically to make it sound impressive, or possibly even to make it hard to compare. Here's a nice description of the (optional) standard: http://www.led-resource.com/ansi-fl1-standard/. One ...


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Assuming it is intended to throw a 1 m^2 patch in front of your bike suggests it may be a ~35 lumen or so light. I think you'd be safe in looking for 100 lumen (or greater) light to replace with. Looking at that price range, I'd think those were reasonable assumptions to make. Unfortunately, without knowing how large a patch it it intending to throw, ...



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