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From Fellrnr.com, Running tips
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# '''GRDE Zoomable'''. The GRDE offers 2000 Lumens for only $20, which seems too good to be true. I've only included this light as a cautionary lesson in what to avoid in a running light. It's heavy, uncomfortable, has too narrower a beam, and is no-where near as bright as it claims. <jfs id="B00R5NMFE4" nonl="true" noreferb="true"/>.
{{:Lights-table}}
The table above includes the absolute brightness (in arbitrary units) that I measured directly. The perceived brightness is based on [https://en.wikipedia.org/wiki/Stevens'_power_law Stevens' power law] to give an idea of how bright the lights will appear to the human eye.
Details of the key factors to look for in a light are further down the page.
=Brightness=
