Look in Bryce7PresetsLensFlaresClay Hagebusch

You will find a directory that says:

Here's how I'm doing flares:
create a radial light
edit in light lab
select Visible, lens flare then image
select import and load one of these lens flare images.

I've highlighted the available flare image to show it's a mixture of White and clear with an alpha blend. Not tried it yet but this is the info available.