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	150 Watt 20000K Metal Halide Bulb - Radium, Double Ended
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	Item Code: MB2812 List Price: $131.99 You Save: $42.00 (31%) Price:     $89.99   Qty:   Shopping with us is safe. Guaranteed. Availability: Usually ships the next business day Write a review Email To Friend Details

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150W 20000K METAL HALIDE DOUBLE ENDED BULB—RADIUM The German-made Radium 20000K metal halide bulb offers excellent coloration and good intensity. It is crisp-white with a strong blue tint. It brings out the fluorescent pigments in corals nicely. Fluorescent supplementation is usually not necessary, but can be used for added intensity and to simulate dawn and dusk. An electronic ballast, magnetic pulse-start ballast or magnetic HQI ballast is required to ignite this bulb. This bulb is white with a blue tint on a magnetic HQI ballast. It will burn more blue on an electronic ballast or pulse-start ballast. An excellent choice for reef tanks up to 22" deep. Common questions/problems concerning metal halide lamps: Metal halide lamps of the same kind are different colors? 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. The metal halide lamp fires and then either burns dull or the arc extinguishes? 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. Do I need a cover shield between the lamp and the aquarium? 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. Can I operate a ballast and lamp together which are designed for different wattages? 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. NOTE: The bulb should be handled carefully. Using soft gloves is a good idea to keep finger prints off bulb. This is during installation and replacement. The average life expectancy of this bulb is 10-12 months. Customer Reviews Write a review 13 of 14 people found the following review helpful: Excellent! The best 150 watt 20K bulb by GREG CARROLL Experience Level: Expert Posted on 8/29/2007 from MIRA LOMA, CA UNITED STATES Comments: All I can say is "Wow!" The color on this bulb is fantastic. Running on an HQI ballast, this bulb burns a crisp blue/white with just enough actinic pop to run this bulb without supplemental lighting. It is suprisingly bright for a 20K which was a pleasant suprise because most 150 watt 20K bulbs are quite dim. Yes, I would recommend this product to my friends. Was this review helpful to you?         4 of 4 people found the following review helpful: Excellent! 150w 20k Radium by ZAC SPATES Experience Level: Expert Posted on 3/18/2008 from SAINT PAUL, MN UNITED STATES Comments: I just switched from a Ushio 10k to a Radium 20k and absolutely love the color I get from the bulb. On my magnetic ballast, I get a nice crisp white/blue without the need for any supplemental actinic. Definately the best 150w bulb I've used. Yes, I would recommend this product to my friends. Was this review helpful to you?         Similar Items   Product: List Price: Our Price: Rating: Item Code: Description: 13000K Metal Halide Bulb - MegaChrome Marine, Double Ended N/A $84.99 to $104.99 We offer a wide variety of Metal Halide bulb choices to suit your aquarium lighting needs. Most of the MH bulbs in the same wattage format can be interchanged. However, please contact us to 20000K Metal Halide Bulb - Megachrome Blue, Double Ended N/A $89.99 to $109.99 We offer a wide variety of Metal Halide bulb choices to suit your aquarium lighting needs. Most of the MH bulbs in the same wattage format can be interchanged. However, please contact us to 20000K Metal Halide Bulb - XM, Double-Ended N/A $69.00 to $79.00 The XM double-ended 20000K metal halide bulb offers excellent coloration and good intensity. It is white with a strong blue tint. It brings out the fluorescent pigments in corals nicely. Fluorescent