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**To**:**Aquatic-Plants at actwin_com****From**:**rjw at aluxs_micro.lucent.com (Ronald Wozniak)**- Date: Wed, 27 May 1998 10:33:56 -0400

> > Could Anyone tell me how many bulb to use on a 20 gallan tank with >Chroma 50? > > >Thank You A 15 watt fluorescent tubes should fit on either a 20 Gallon or 20 Gallon High tank. As posted last week: For fluorescent lighting that extends across the length of the tank (that are 16 to 24 inches deep), 2-3 watts per gallon is recommended. (Depending on the type of plants you want to grow and how often you want to trim them.) 1 tube every 3 inches of tank width gives about 3 watts/gallon. 1 tube every 4 inches of tank width gives about 2 watts/gallon. Standard pet shop lighting, (which is about 1 tube for every 12 inches tank width,) gives about 3/4 watt/gallon. Examples: For 20 Gallon High tank (12 and 1/2 inches wide and length of 24 inches): 4 tubes (15 watts x 4) gives you about 3 watts/gallon. 3 tubes (15 watts x 4) gives you about 2 watts/gallon. For 55 Gallon tank (12 and 1/2 inches wide and length of 48 inches): 4 tubes (40 watts x 4) gives you about 3 watts/gallon. 3 tubes (40 watts x 3) gives you about 2 watts/gallon. For 90 Gallon tank (18 inches wide and length of 48 inches): 6 tubes will give you about 3 watts/gallon. 4 tubes will give you about 2 watts/gallon. --------------- Ron Wozniak Allentown PA, USA rjwozniak at lucent_com

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