Arcadia 150W 20000K Double Ended Halide Bulb - AQIBLU150
As light passes through seawater, much of the visual content is filtered out rapidly - with the light at the red end of the spectrum being the light that penetrates least, and the blue end penetrating the furthest.
As a result the light on reefs in the natural environment changes rapidly as the water depth increases. At the very surface, down to a depth of only a few feet, the light in the water has a bright blue-white appearance, as replicated by the 14,000K lamp.
As depth increases, and the light is gradually lost - starting at the red end of the spectrum, the water takes on a deeper blue appearance. Photosynthetic invertebrates at this depth have evolved to rely purely on this blue light, and have lost the ability to photosynthesise using red light (as land plants do).
The '20,000K' lamp has been developed to replicate this environment in the slightly deeper water - providing the light levels that the organisms need, and also creating an attractive 'moonlight' effect in the aquarium.
The Arcadia Series 3 range of pendants is an ideal way of housing, and optimising metal halide lamps
They contain a specifically designed reflector, which focuses the lamps output into the aquarium, and by using the adjustable deflectors, the light spread can be altered to cover the entire aquarium without causing glare to any onlookers.
With the exception of the mini version, all models contain supplementary lighting from fluorescent tubes, and built in timers, so that a fixed daily photoperiod can be set.
