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250 Watt 20000K Metal Halide Bulb - XM, Mogul Base

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MB6813

This item has been discontinued.

XM Lighting

250W 20000K METAL HALIDE SINGLE ENDED BULB—XM

The XM 20000K metal halide bulb offers excellent coloration and average 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 22"–30" deep.

Common questions/problems concerning metal halide lamps:

  1. 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.
  2. 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.
  3. 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.
  4. 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.

Bulb Replacement Guide
Bulb Types Life of Bulb*
Normal Output Fluorescent 6-12 months
Very High Output (VHO) 6-12 months
Power Compact (PC) 9-12 months
T5 High Output (T5HO) 9-18 months
Metal Halide 9-12 months
LED (non-moonlight) ~5 years (50,000 hours)
* Manufacturer Recommendations
 



**Please Note** Pulse start type lamps may ignite and work just fine on a probe start ballast for a few months; however, as the lamp ages, the electrodes erode and higher voltage is needed to start the lamp. The open circuit voltage provided by probe start ballasts is not sufficient to ignite a pulse start lamp.




Manufacturer Info

XM Lighting
XM Lighting is the leading manufacturer of high quality metal halide lamps for the aquarium industry. XM Lighting began in 2003 and took the hobby by storm with high PAR levels, high quality lamps, and world class customer service. XM Lighting quickly became the hottest selling lamp in the industry, and they`ve continued the trend by developing new lamp wattages and color temperatures to meet the ever changing demands of the aquarium hobby.

20 Reviews

JEFFREY HEYMAN from PLANO, TX UNITED STATES

05/12/2012

Experience Level: Intermediate

Great Bulb

Fired right up and both bulbs I bought throw off a very consistent color. Recommended!

2 out of 2 found this review helpful

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ANGEL PEREZ from SOUTH CHESTERFIELD, VA UNITED

03/29/2012

Experience Level: Expert

20000K Metal Halide Bulb - XM,

The lights are awesome! Great color on my corals. Great price too.

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ANTHONY HOWLETT from HIGHLAND HOME, AL UNITED STATE

02/27/2012

Experience Level: Intermediate

thanks marine depot

The Xms out perform any other 400 moguls I've used very nice coloration in corals like the way the bulbs start up.

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PATRICK WHELTON from MOBILE, AL UNITED STATES

04/12/2011

Experience Level: Intermediate

great service

have had a great overall experience with these bulbs in the past.

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RUSS from Yelm, WA UNITED STATES

02/12/2010

Experience Level: Expert

20000K

Coral and Fish love them, Excellent bulbs.

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stifflkd from FLEMINGTON, NJ UNITED STATES

12/08/2009

Experience Level: Intermediate

XM250 20000K

Bought this bulb by mistake. Normally use a XM250 10000K. This bulb does not nearly have the PAR output as the 10000K. My pH has dropped by .3 ever since I made the change. I am not a fan of the bluer tint that 20000K's have and the lower PAR is a even bigger disappointment.

0 out of 3 found this review helpful

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reefgiant175 from BRANDON, SD UNITED STATES

02/17/2009

Experience Level: Intermediate

Good Bulb!

This is my second round with XM bulbs. I was impressed the first time and am just as satisfied with the new ones. These bulbs have a great PAR value. Will most likely be using these again in the future.

0 out of 1 found this review helpful

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EDWARD TREMMEL from OLATHE, KS UNITED STATES

11/12/2008

Experience Level: Expert

NOT IMPRESSED!

This was my first purchase of an xm bulb. After 2-1/2 months the bulb has quit working. I am now in the process of returning the faulty product to the manufacturer.

1 out of 3 found this review helpful

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EDUARDO BANDEIRA DA ROCHA OLIV from DORAL, FL UNITED STATES

06/04/2008

Experience Level: Expert

Nice Blue

Nice Blue tint, I recomend!

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YUI VO from RICHMOND, VA UNITED STATES

06/01/2008

Experience Level: Beginner

This bulb has value.

It's a good value bulb that renders nice colors.

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