Followup
The 4 pack of InnoGear arrived.
They look fairly sturdy. I looked for a pipe I could stick them on, but could not find a fit.
I planted one outside on a cloudy day.
It seemed to last about 6 hours.
So I found my silicone Conformal Coating opened up the remaining 3 lights and "painted" the few contacts on the circuit board.
Of note - there was a double dab of probably silicone RTV type stuff on the contacts. On 1 of the 3 lights I opened the "dabs" fell off.
I then deployed them where I wanted them by the drive.
The first one I had put out lasted from about 1910 to 0300 after a full days sun.
The second one went from 1910 (sunset) 0645 (dawn) after a full days sun.
The other 2 have not yet got a full days sun and are stuck where they get some shade during the day.