I've been looking for a 3rd light to use as a back light in a 3-point lighting setup for macro with my 2 Keldan Luna 4X lights as key light and fill light. The idea is that the 3rd light shines from behind, creating a halo effect, making the subject pop out from the background.
I was originally looking at spotlights, but struggling to find something near the colour temperature of the Keldans and a narrow beam. The nearest I've come is the RGBlue System 01 with the RGB-SA01 searchlight adapter (lower down that page), which narrows the beam to 30 degrees. It's more expensive and larger than I was originally looking for. There are narrower and/or smaller lights than this but usually a much higher colour temperature.
Then I got to thinking of a snoot for the back light (and for typical snoot shots), and I notice that there is a reductive snoot kit available for the RGBlue.
Are there any transmission snoots (fibre optic) that could be used with the RGBlue light?
And while we're at it are there any snoots, either reductive or fibre optic, that could be used with the Keldan Lun 4X? The outside diameter is 72mm.
Finally, anyone tried 3-point lighting or snoots for underwater video, or have any thoughts on it?