In order to take pictures in conditions like this, (and also in hope of shooting some videos) I assembled a circular UV LED light, and recently I finally got to test it.
I used 32 LED bulbs from 365 to 405, and adjusted their proportion to give similar white balance result as from the sunlight, the photos taken all used the same white balance setting I made in lightroom with some help from photoshop. In other software such as capture 1, a proper white balance will give more violet instead of blue. My different color is entirely a result of the software. However, I found the combination of yellow and blue aesthetically more appealing therefore I didn't try to change it.
I shot a range of flowers including many types of sunflowers, the light is strong enough for me to handhold to take pictures, and judging from the pictures, I think my LED light can resemble natural light close enough as far as UV false color is concerned, especially when the camera can only effectively record wavelength above 350nm.
The pictures are taken on a converted Sony A7S, with a 40/2.8 Seiko lens from a Mamiya rangefinder, 1st generation SEU filter was used.
Exposure setting: all phots are taken with 1/50 shutter and 5.6 aperture, ISO setting changes between 1600 to 4000 depending on the distance.









Edited by BruceG, 06 October 2018 - 17:33.