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Aquarium Supplies
Home » Saltwater Aquarium Supplies  » Lighting  » Light Bulbs  » Metal Halide  » Single Ended  » 175 Watt  »  20000K Metal Halide Bulb - XM, Mogul Base
20000K Metal Halide Bulb - XM, Mogul Base

20000K Metal Halide Bulb - XM, Mogul Base

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$63.99 to $73.99
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20000K Metal Halide Bulb - XM, Mogul Base Information


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. This bulb is white with a blue tint on a magnetic HQI ballast. It will burn more blue on an electronic ballast or standard magnetic ballast. This bulb will work with a standard magnetic ballast, magnetic pulse-start ballast or electronic ballast. A good choice for reef tanks up to 18" 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.
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20000K Metal Halide Bulb - XM, Mogul Base Reviews

Average Rating
(20 reviews)
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of 2

Great Bulb

Reviewers Rating Excellent!

Posted: 5/12/2012 from PLANO, TX UNITED STATES
5.0 5
Experience Level: Intermediate

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

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20000K Metal Halide Bulb - XM,

Reviewers Rating Excellent!

Posted: 3/29/2012 from SOUTH CHESTERFIELD, VA UNITED
5.0 5
Experience Level: Expert

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

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thanks marine depot

Reviewers Rating Excellent!

Posted: 2/27/2012 from HIGHLAND HOME, AL UNITED STATE
5.0 5
Experience Level: Intermediate

Comments: 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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great service

Reviewers Rating Great

Posted: 4/12/2011 from MOBILE, AL UNITED STATES
4.0 5
Experience Level: Intermediate

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

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Reviewers Rating Excellent!

Posted: 2/12/2010 from Yelm, WA UNITED STATES
5.0 5
Experience Level: Expert

Comments: Coral and Fish love them, Excellent bulbs.

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XM250 20000K

Reviewers Rating Below Average

Posted: 12/8/2009 from FLEMINGTON, NJ UNITED STATES
2.0 5
Experience Level: Intermediate

Comments: 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.

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Good Bulb!

Reviewers Rating Excellent!

Posted: 2/17/2009 from BRANDON, SD UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: 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.

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Reviewers Rating Unsatisfactory

Posted: 11/12/2008 from OLATHE, KS UNITED STATES
1.0 5
Experience Level: Expert

Comments: 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 of 3 People found this review helpful, did you? Yes No

Nice Blue

Reviewers Rating Excellent!

Posted: 6/4/2008 from DORAL, FL UNITED STATES
5.0 5
Experience Level: Expert

Comments: Nice Blue tint, I recomend!

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This bulb has value.

Reviewers Rating Excellent!

Posted: 6/1/2008 from RICHMOND, VA UNITED STATES
5.0 5
Experience Level: Beginner

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

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of 2
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