For lighting home pond use such lamps:
The most common type of illuminator is one or several fluorescent lamps complete with control gear, going either for each lamp separately, or assembled into a control unit for several lamps. Usually the lamp is 15 cm shorter than the length of the aquarium and is installed along the aquarium in the lid.
It is necessary to use only specially designed for aquarium PRA systems, since they are designed to operate in high humidity conditions. But they should not come into contact with water in an aquarium under any circumstances.
For example, at the ends of electrical wires that enter the lamp, waterproof plastic cuffs are installed to protect the contacts from moisture. The diameter of the cuffs may be different, that when buying fluorescent lamp for aquarium must be considered. There are special fluorescent lamps that provide the necessary for certain purposes of the glow in different ranges of the spectrum, but the price of such lamps is usually high.
If there are no special requirements, then a fluorescent lamp from a household goods store is fine, and it is also cheaper.
Incandescent lamps only recently they began to “lose” the rating, so far they have been widely used in aquarism. The efficiency of the incandescent lamp is very low, since only a red-hot coil converts 20% of the energy into light, and 80% into heat.
Therefore, these lamps are more heating than lighting.
Discharge lamps apply in aquaria began relatively recently. Metal halide and mercury lamps are available, but they are used in an aquarium without a cap. The source of light in such lamps is the glow of metal vapors (sodium, mercury or halogen), formed under the action of an electric arc.
Often these lamps are used to illuminate open large aquariums, as these lamps are very powerful. For home use there are low-power options for gas-discharge lamps, their advantage in high brightness with low power consumption and heating. However, they are a point source of light that can be used for decorative purposes.
If you illuminate only parts of the aquarium with discharge lamps, leaving others in the shade, you get a natural effect of sunlight. The disadvantage is the high cost of both the lamp itself and the control and power supply unit.
They also make high demands on protection against water, due to the high operating voltage.
One of the advantages halogen bulbs Incandescent is a bright glow and a spectrum of light close to the sun. When lighting a separate area or object, such a lamp is indispensable.
The disadvantage of halogen lamps with an operating voltage of 220 volts is their high cost and relatively short lifespan. Low-voltage lamps of this type are more durable, but require connection only with a current converter, which also affects the cost of the illuminator.
All the disadvantages of incandescent bulbs and halogen lamps, the difference between them only in the gas that fills the flask.