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Discussion Starter · #1 ·
Wanted to know if you have 2 65watt pc bulbs total of 130watt over a 55gal would you really have only 65watts because the other bulb doesn't reach the other side of the tank? Now a pc bulb has 2 long glass bulbs on each 65watt bulb so is really 32+watts each tube or just a total of 65watt?
 

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A 65 watt bulb is a 65 watt bulb, whether it is 22 inches long, made of one tube, 2 tubes or 4 tubes. The wattage is just the amount of electrical power the bulb uses. How much light such a bulb puts out depends on what kind of reflector it has. And, whether that gives you high, medium, or low light depends on how far away from the bulb you are measuring the light - how high the tank is and how high above the tank the bulb is. If you have a 48 inch long tank with a single 22 inch long bulb lighting it, the area under the bulb will be lighted well, but the ends of the tank will effectively be dark. So, the bulb or bulbs needed depend on how long the tank is vs the bulb length, and how high the tank is. Plus, tanks more than 12 inches or so front to back don't get uniform lighting with a single row of bulbs above them unless that row is raised well above the top of the tank. For those, two rows or even 3 rows of bulbs is better. And, the farther apart the rows are, the better.
 

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Discussion Starter · #4 ·
Thanks for the info Hoppy
A 65 watt bulb is a 65 watt bulb, whether it is 22 inches long, made of one tube, 2 tubes or 4 tubes. The wattage is just the amount of electrical power the bulb uses. How much light such a bulb puts out depends on what kind of reflector it has. And, whether that gives you high, medium, or low light depends on how far away from the bulb you are measuring the light - how high the tank is and how high above the tank the bulb is. If you have a 48 inch long tank with a single 22 inch long bulb lighting it, the area under the bulb will be lighted well, but the ends of the tank will effectively be dark. So, the bulb or bulbs needed depend on how long the tank is vs the bulb length, and how high the tank is. Plus, tanks more than 12 inches or so front to back don't get uniform lighting with a single row of bulbs above them unless that row is raised well above the top of the tank. For those, two rows or even 3 rows of bulbs is better. And, the farther apart the rows are, the better.
 
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