Originally Posted by walrus1
How visible is the Radbot during the day? I've read reviews and seen videos that seem to suggest it's not quite powerful enough for daylight.
While I have not compared the RB directly w/ a DZ, I have compared RB w/ half watt Blinkies I do have (Blackburn mars 3.0, Original half watt Superflash).
As well as the 1w SF Turbo and 2w HotShot.
RB and SF-T about equal brightness and sweet spot size.
Both notably brighter than half watt blinkies w/ same size sweet spot. HotShot sweet spot is much (maybe 2x) brighter, but approx. half the size of the RB and SF-T.
My results compare favorably w/ the more sophisticated and extensive results I found in "Review of the Best Bicycle Tail Lights in 2012" dated Mar 5, 2012 by nhinkle (my most humble apologies for the weak linky-foo).
Inputting the Quoted Title into google brought up the proper Bicycles Community Blog webpage.
Daytime performance of these blinkies is CRITICALLY
dependent on Battery Condition AND how well the lights are Aimed.
Alkaline "throw-away" batteries with several hrs in flashing mode already on them, while being perfectly fine for night use, will show a noticeable loss of brightness compared to lemony springtime fresh out of the package batteries in a side by side comparison white wall test.
Using high quality Rechargeable NiMh batteries (Eneloops) will markedly reduce this problem, as will a Li-Ion powered light.
Additionally Daytime Use can be very unforgiving of 'casually' or 'improperly' aimed blinkies.
This is of EXTREME
importance with the HotShot due to it's Tightly Focused half size sweet spot.
Floppy/Loose mounting on a fabric 'Blinkie' loop on the back of a rack trunk or seat bag just won't work.
Neither will a solid mount on a part of the bike that because of incompatible mechanics and/or angles will not allow the expanding cone of the sweet spot to point right into overtaking traffic.