I got this reply from Ray this morning.
"Dear Paul,
thanks for your kind inquiry, the below type is only IP66,because is made by injection machine, not by silicon filling.
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Login how about the below type,which is real IP 68 rated:
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Login of course, we can make it with TM1804 IC 12v.
looking forward to your reply!
thanks and best regards
------------------
Ray"
I ordered a few the 735789822 alternative with the 2811 IC a while back, They are definitely waterproof but do not provide the ease of mounting of the flat bottom design. I've told him that several DLA members are interested in using these for mega trees and we are looking for a simple and reliable way of mounting these on a strong, flexible and inexpensive and possibly translucent strapping. I've also enquired about the possibility of him manufacturing something with 12mm pre-punched holes with 4.25 in spacing. Will let you know when I hear back.
Paul.