Currently, T5 lights are the most popular form of lighting a reef aquarium. Years ago, aquarists struggled to keep corals because the light was not intense enough. These new T5 bulbs are more intense than traditional bulbs and use significantly less power. The fixtures are extremely sleek and fit inside more aquarium canopies. Each bulb should last for about one year before it needs to be replaced.
When comparing T5 to VHO there are several advantages. The biggest difference is the amount of power each bulb uses. The VHO bulb uses 110 watts of power and the T5 bulb uses 54 watts of power to light a 48 inch lamp. Yet, the T5 bulb puts out significantly more intense light. VHO also requires a larger electronic ballast that can be difficult to mount in tight places. T5 bulbs are also significantly smaller in diameter which saves space.
There are also a wide range of T5 bulbs available. Popular brands are ATI, Giesemann, UVL and Ice Cap. These manufactures make bulbs with varying colors ranging from 6,500K, which is a yellow to a 10,000K crisp white to a 420nm actinic. You can mix and match between brands and colors to create the ideal light color for your aquarium. Most fixtures come with bulbs and may offer two switches to control both daylight and actinic bulbs to create a dawn/dust effect. The stock lighting arrangement is usually a one to one ratio of daylight to blue bulbs. Some people are just fine with this combination, but you may prefer to replace one of the white bulbs with another actinic bulb. Fixtures and replacement bulbs are readily available for tanks 24 inches to 72 inches long. Standard bulb wattages are 24 watts, 39 watts, 54 watts and 80 watts.
When you are ready to buy a T5 light, start by searching online. This form of lighting will allow you to keep almost any variety of coral. Most tanks require four to six bulbs for the best effect. I prefer to use three actinic bulbs for every daylight bulb, but most stock fixtures come with one actinic bulb for every one daylight bulb. Another reason to use T5 lighting is it will help your corals grow faster. This is important if you have many coral frags.
If you plan to hang the T5 fixture, make sure to order a hanging kit. Most light fixtures come with mounting legs that fit on the aquarium trim. If you do hang your light, make sure that it is firmly mounted. That way it will never accidentally fall into your aquarium. Some hobbyists put it on adjustable pulleys or chains.
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