My husband did have a question with the Coralife 2 bulb T5NO light, he was wondering if it's enough wattage for a 55 gallon tank. Here is the link you sent. . .thanks! Question was regarding an Amazon Biotope aquarium set-up.
Hi Hoppy, I am new to the forum and just posted a discussion for my planted 75 gallon, I have been having some problems with growth and was wondering if you would be able to take a look and provide me with some feedback on lighting? I hear you are the king of lighting planted tanks so any advice you can give me would be great!
T5 means 5/8 inch diameter tube, T8 means 8/8 inch diameter tube, T12 means 12/8 diameter tube, etc. HO means high output. T5HO are 5/8 inch diameter tube fluorescent bulbs, which use a ballast that drives them at about 1.5 times the wattage as T5NO (normal output) bulbs. So, a 48 inch T5HO is a 54 watt bulb, but a 48 inch T5NO bulb is about 38 watts, as I recall. The HO bulbs are designed to be driven at the high wattage, and the ballasts for them are designed to baby them as they start up, so the higher power doesn't shorten their life.
Power compacts, or what we usually refer to as PC bulbs, are the two parallel tube, but interconnected, usually 5/8 inch tube, fluorescents, that are operated at a lower wattage per foot of bulb than T5HO bulbs are. In the UK I think they refer to the spiral screw-in bulbs as power compacts but I'm not sure. PC bulbs, in our usage of the term, have 4 contacts on the plug-in end, either in a straight line, or arranged in a square pattern. But, as far as I know we use them with a single power wire to each pair of contacts, so I don't know why they have three contacts.