how much light is too much?
well im gonna try to change my reflector from a 20w halogen lamp to the energy saving lamps, they r equal to 60w but only consume 14w and they say they r "DAY LIGHT" lamps, i have a 4 pack of them and 3 light sockets
is 2 good enough or should i put 3 in?
tank is a 29 gallon tank that i am converting from fake plants to real ones.
2 would be 4.1WPG and 3 would be 6.2WPG
if it goes by consuming wattage then with 2 bulbs i will have approx 1wpg and w/ 3 i will have 1.4 WPG
Do you have a link to the lights that your talking about? This would give us a better ideal of what you are trying to do.
If your new to the plant hobby, IME, 1.5-3wpg is a good starting point for a 29 gallon tank.
This is also more light than most new plant hobbies can work with.
The screw in compact flourescent bulbs don't give off that much light unfortunately, otherwise I would use them now for my higher light needs.
60 watts of light may equate to 180 watts total but with restrike, dispersion and the lack of good effective reflector they will not require CO2 for the tank. I have a friend that uses 2 60 watts bulbs over a 10 gallon tank and grows plants well but doesn't need CO2.
I would say the equivelant light is only going to be about 25% so a 60 watt bulb is only going to give you a rating of 15 watts or basically the usage watts as Dave1 stated. Mess with it and see what it can grow, you may only need 2 of them or you may need all 4 to get the plants to grow. Screw in compacts are a new thing and there is a lot of information to still be gathered in their effectiveness and equivelant watts for aquarium uses.
Now a bank of these lights over a 55 gallon tank, say 6 of them with a good white background and an enclosed fixture might actually be enough light. It is just too hard to guess. Give it a shot and let us know how it works. I wish I could afford a water proof light guage to test the light levels but then I couldn't afford to feed the fish. :shock:
Laying them sideways and trying to make sure that the rods of the bulbs are parallel to the surface of the water may help some but again, it is all speculation.
Wattage has nothing to do with the amount of light in an aquarium. Wattage is the amount of energy it takes to create the disensed illumination. Lumens is what is important. How many lumens does the lamp give off? Divide wattage by lumens to determine the efficiency of the bulb. Another important item to be considered would by length of spectrum, ie. how much spectral light does the lamp give off. Is the lamp's range toward the red or the blue? Full spectrum lighting is the effect we are usually looking for. We are trying to reproduce natural sunlight.
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