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Techie stuff....
I've run some tests to establish the level of subject illumination using the various coloured LED's and diffusers. The pdf file in the following link is a table of exposure values with the output set to maximum.
Seabed dioramaHeatherPyriteEuropean Privet berriesCommon sedgeSteel ball bearing spinning around a tray.Ping pong ball passing through light beamsMiniture vanCôtes du RhôneSea Urchin-Echinus esculentusMarine eroded basaltCoypu skullThistleHawkweedCartilage lichen (Ramalina) on an oak twigCartilage lichen (Ramalina) on an oak twigSwallowtail caterpillarSwallowtail caterpillar