analysis on light properties and light sources (Delbeek &
Sprung 1994; Fossa & Nilsen 1996; Osingaet al.2008).
Most research on the effect of light on symbiotic corals
has been focused on quantity, rather than on quality or
technology, although the latter aspects may be of equal
importance for aquaculture and aquarium hobbyists. Only
few studies evaluated the energy efficiency of different light
sources (e.g. Wijgerdeet al.2012b; Rochaet al.2013a; Wijgerde & Laterveer 2013). Comparative evaluation of different light spectra and technologies is also of interest to
aquarists trying to boost coral colours, but these aspects
have up till now hardly been investigated by scientists.