First Stop Aquatics > Lighting > Metal halide Lamps > Arcadia Metal Halide Lamps > Arcadia Double Ended RX7 150w
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.
Why should I use a metal halide lamp?Metal halide is commonly accepted as the best substitute for nature when it comes to aquarium lighting.The exceptionally high light output when compared to other lamp types such as fluorescent tubes, makes them a very effective light source, particularly for the larger tank set-up.We all want the creatures in our care to be as healthy as possible, but if we can achieve this without compromising the aesthetic appeal, so much the better. This is why we have developed our new 14,000 Kelvin lamp.The output actively promotes photosynthesis within the tissues of those invertebrates which utilise symbiotic zooxanthellae, and so allowing healthy growth. The lamp is available in three sizes - 150W, 250W, and 400W - The latter being particularly for the deeper than average aquarium, or those containing species of stony corals with a very high light demand.
