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Home » Aquarium Supplies  » Lighting  » Bulbs  » Metal Halide Bulbs  »  250 Watt 10000K Metal Halide Bulb - XM, Double Ended
250 Watt 10000K Metal Halide Bulb - XM, Double Ended

250 Watt 10000K Metal Halide Bulb - XM, Double Ended

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250 Watt 10000K Metal Halide Bulb - XM, Double Ended Information


The XM double-ended metal halide bulb offers good coloration and intensity. The crisp-white color will illuminate your tank nicely. It is very similar to an Ushio10,000K bulb but slightly more yellow.  Actinic supplementation may be used to create a bluer look. This bulb will work with standard magnetic ballast, magnetic pulse-start ballast, magnetic HQI ballast or electronic IceCap ballasts. It must also be housed inside a pendant. It cannot be used with simply a reflector in an open application as UV rays emitted by the bulb must first be filtered with a UV-proof lens. An excellent choice for reef tanks 22"–30" deep. on how the different Kelvin ratings appear and more information on metal halide bulbs.

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: Double ended bulbs should always be used with the UV shield (supplied with most pendants). You and your corals can suffer from excess UV radiation otherwise. The bulb should be handled carefully as well since it has no outer glass casing. 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

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.

250 Watt 10000K Metal Halide Bulb - XM, Double Ended Reviews

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switch fromm 14k to 10k!

Reviewers Rating Average

Posted: 1/26/2010 from Sacramento, CA UNITED STATES
3.0 5
Experience Level: Expert

Comments: i recently switched from 14k phoenix to 10k xm. as far as looks go, these lights are yellow and make my tank look horrible. none of my sps colors show well; greens, reds, blues, and purples all look bad. as for growth rate, (which is why i switched to 10k) most corals are continuing to grow at the same rate as with the 14k with exception of a red milli and a palmers blue milli. both these millis were at the bottom of my 24" tall aquarium and have not grown at all since being placed there as of 3 months ago. within a week of installing the 10k's both corals have new growth on their tips and are now growing at a relatively fast pace. happy with growth, not at all happy with the color and overall look of the tank. will switch back to phoenix or radium 20k in 5-6 months after this "grow-out phase"

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Second Dud and counting!

Reviewers Rating Unsatisfactory

Posted: 10/11/2009 from LEAGUE CITY, TX UNITED STATES
1.0 5
Experience Level: Expert

Comments: I have used Ushio 10K lamps for almost nine years and have had nothing but outstanding performance and results in my SPS corals.Well, I did some homework on some of the work Sanja Joshi publishes on PAR, PFD, and CCT numbers and the XM 250W DE lamp had some great numbers. So, I thought I would buy a couple this time around when it came time to replace the Ushios.I bought two and one of them is performing beautifully and really does seem to be visibly brighter than the Ushios. The problem is that the second XM lamp is yellow and not very bright. So, I sent it back ($8 shipping) and got another one. Guess what, same problem. I know it is not the ballast because I have swapped lamps. So, I have to send another lamp back. Another $8 shipping charge? This lamp replacement is getting expensive and I am not convinced I am getting a quality item. I never had this problem with the Ushios in all these years.Now, I am really at the point where I would rather go back with the Ushios.Make your own decision as to whether or not you trust this lamp. I am just stating the facts.

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So far so good

Reviewers Rating Great

Posted: 2/26/2008 from ARCHBALD, PA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: I like the bulb. The color seems to be whitish w/ hints of blue. I replaced a 20k bulb with this one because I am looking for more coral growth. With the 20k bulb, growth was at a standstill. My tree coral looks like it hit puberty and my xenia are sprouting new branches. I'm very pleased.

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Reviewers Rating Unsatisfactory

Posted: 2/19/2008 from BRONX, NY UNITED STATES
1.0 5
Experience Level: Intermediate


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Reviewers Rating Great

Posted: 1/6/2008 from COLCHESTER, CT UNITED STATES
4.0 5
Experience Level: Expert

Comments: I got these bulbs to replace the stock ones that came in my Coralife Pro series. Work great and are like the ones I took out (1 yr old ). They will take a couple of days running till you get the actual brightness that they are going to be,(common thing with M/H lighting. Service from Marine Depot was, as always GREAT!!!

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bulb quality

Reviewers Rating Excellent!

Posted: 9/20/2007 from ORLANDO, FL UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I am very satisfied with this product

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