250W 5500K METAL HALIDE SINGLE ENDED BULB
The 5500K metal halide bulb is a full-spectrum Daylight bulb. It offers excellent light intensity, but will be slight yellow-green in coloration. A great bulb to achieve fast growth. Actinic supplementation is recommended to add more intensity in the blue spectrum and to simulate dusk/dawn. This bulb will work with a standard magnetic ballast or an electronic ballast. This 250W bulb is great for reef tanks 22"-30" deep. on how the different Kelvin ratings appear and more information on metal halide bulbs.
As a general rule of thumb, use one metal halide bulb for 24" of tank length. Most of the Metal Halide bulbs in the same wattage format can be interchanged. However, please contact us to make sure. Metal Halide bulbs are one the most difficult aspects of the hobby to recommend. Most of the information here is general.
Common questions/problems concerning metal halide lamps:
Metal halide lamps operate by passing an electric arc through an arc tube that excites particles in the arc tube. When the metal particles reach an excited state they emit energy in the form of visible light. It takes 100 hours of operation before the metal particles stabilize and become a consistent color. All metal halides require 100 hours of operation before color and light output stabilize. All metal halides inherently have a slight color variation between individual lamps.
Usually the ballast and lamp are not receiving enough power. Metal halides pull a high current. Usually the problem is either there is too great a load on the circuit or the extension cords are of a small wire size and can`t handle the power needed by the ballast. Use only heavy duty extension cords and try running a ballast off a circuit from another part of the house.
Metal halide lamps produce a large amount of UV and also have a potential of exploding. The single ended metal halide lamps have an outer jacket which eliminates most of the UV. However, they have an inherent risk of exploding and UL requires metal halide lamps to be enclosed. On double ended lamps there is no UV shield. Double ended lamps must have a glass shield or major eye injuries including blindness may occur.
Each wattage lamp and ballast are designed together for optimal performance and safety. If you over drive the lamp it may explode and shorten the life of the ballast and lamps. If you under drive the lamp it will also shorten the life of both components and also may explode. Do not mix different type wattages of lamps and ballasts.
Bulb Replacement Guide Bulb Types
Life of Bulb*
Normal Output Fluorescent
Very High Output (VHO)
Power Compact (PC)
T5 High Output (T5HO)
~5 years (50,000 hours)
* Manufacturer Recommendations
**Variations of this product can be found in many online stores. The version we carry is of the highest quality. Although this item is eligible for price matching under our Low Price Guarantee, please be certain the product you want to price match is the same make and model.
Since 1983, they`ve created a constant stream of new systems for customers. Their range of optimized lamps and ballasts, including the revolutionary Uni-Form® pulse start system, has grown to encompass lamp wattages 50 to 2,000. This unique focus offers you peak performance lighting solutions. The Solon, Ohio headquarters includes a state-of-the-art development and new products manufacturing center to support our leadership in originating new systems.
Accessories for 250 Watt 5500K Metal Halide Bulb, Mogul Base