I've been using these for a few years. Espresso for partly cloudy to bright sun, amber for cloudy or low light, clear for dark conditions.
http://store.pksafety.net/uvgeblcl.html
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.