Great Aquariums Start Here
Live Chat Support
    Free Shipping On $75+
  • FREE Shipping On $75+
  • 14-Day Low Price Guarantee
  • Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on
Orders Over $75
Standard ground shipping (1-7 business days) starts at a low $4.99 and most orders over $75 ship FREE. Learn More
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More
Home » Saltwater Aquarium Supplies  » Lighting  » Light Bulbs  » Metal Halide  » Double Ended  » 150 Watt  »  150 Watt 20000K Metal Halide Bulb - XM, Double-Ended
150 Watt 20000K Metal Halide Bulb - XM, Double-Ended

150 Watt 20000K Metal Halide Bulb - XM, Double-Ended

Average Rating 4.5 20
Write A Review
Product Review
We value your opinion & experience
Thank you for taking the time to review our products!

This is a Product Review for: 20000K Metal Halide Bulb - XM, Double-Ended
Name to display on the review:
Location (ex: Anaheim, CA):
Your experience level:
How would you rate this product?
Review Title:
Write your review:
(Please focus on product quality and performance)
LOW STOCK ALERT: Only 7 left—order now!
In Stock: Buy now and your order will ship the next business day
Item #:
MSRP: $79.95
You Save: $9.96 (12%)
Notify Me
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
Add to Cart or Notify Me
This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.
Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

+ Add to Wishlist
Add to Wishlist
Select Wish List:
Comments (up to 200 characters):
Quantity Desired:
Quantity Received:
FREE Shipping Promo offers FREE standard ground shipping via UPS on orders of $75 or more for orders containing non-overweight or oversize items (orders which do not qualify for our FREE shipping promotion will still be shipped at a discounted rate).

Terms and Exclusions:
  • Offer valid only on orders shipping within the contiguous United States. Orders shipping to Alaska, Hawaii, Puerto Rico, Guam or other US Territories do not qualify for this promotion.

  • This promotion does not apply to items requiring expedited shipping, such as refrigerated products, frozen products or live rock.

  •'s FREE shipping promotion does not include products sent in oversized or particularly heavy boxes. This may include but is not limited to aquariums, canopies, chillers, external water pumps, metal halide magnetic ballasts, stands and substrate/sand. These items may be subject to additional shipping handling charges. Should shipping surcharges apply, they will be noted on individual product pages and / or displayed during check-out. We will, however, pay a portion of the shipping charges for these orders.

  • Shipping surcharges, such as special handling are NOT covered under the FREE shipping promotion.

  • Shipping charges for returned merchandise is non-refundable. Please read's Return PolicyPolicy for more information.

  • Price matched (Low Price Guarantee) or discounted orders do NOT qualify for our free shipping promotion.
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us.

Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions.
Shipping Cost*
Competitor's Website*
*Required information
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

150 Watt 20000K Metal Halide Bulb - XM, Double-Ended Information

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 supplementation is usually not necessary, but can be used for added intensity and to simulate dawn and dusk. 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 up to 18" 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.

150 Watt 20000K Metal Halide Bulb - XM, Double-Ended Reviews

Average Rating
(20 reviews)
Sort Reviews By:
of 2

Flawless Bulb

Reviewers Rating Excellent!

Posted: 11/21/2013 from Owings Mills, MD UNITED STATES
4.5 5
Experience Level: Expert

Comments: Purchased this for a friends bio cube HQI. The 20k is a brilliant blue and gives the water a cool (temperature) appearance. Bulb fires up with no issue, and lasts a solid 8 months before the color begins to shift. Burn in time is around a week, and this product will not disappoint.

Did you find this review helpful? Yes No

Great bulb

Reviewers Rating Excellent!

Posted: 3/12/2013 from MAGNA, UT UNITED STATES
4.5 5
Experience Level: Intermediate

Comments: The bulb has been installed only for a few days and it is bluer than my 14K Phoenix was. I am still waiting to see how well the corals take to the new light spectrum and if they color up a bit.

Did you find this review helpful? Yes No


Reviewers Rating Excellent!

Posted: 12/2/2011 from TELFORD, PA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I had the xm bulb before. When it was time to replace Itried another brand.It was too bright,not enough blue.My corals were hating life (not opening and shrinking)so I immediately ordered an xm. After being on for 2 days my corals opened and my zoo's are poppin.Awesome bulb and I highly recommend it to all my fellow reefers.

Did you find this review helpful? Yes No

250W 20K Bulbs

Reviewers Rating Excellent!

5.0 5
Experience Level: Expert

Comments: these bulbs are just what I wanted- nice color and you guys had the best price on the internet. I'm satisfied.

Did you find this review helpful? Yes No

20000K Metal Halide Bulb - XM,

Reviewers Rating Unsatisfactory

Posted: 4/22/2010 from Brooklyn, NY UNITED STATES
1.0 5
Experience Level: Intermediate

Comments: Will not be buying this again. Surprisingly for 20000K the 'strong blue tint' isn't that blue and the worst thing about it, is that the porcelain ends are extremely fragile

1 of 2 People found this review helpful, did you? Yes No

Not for me

Reviewers Rating Average

Posted: 1/5/2010 from DALLAS, TX UNITED STATES
3.0 5
Experience Level: Intermediate

Comments: I like blue but it's a little too blue for me. It not so much the blue that I don't like it's the darkness.. it's way darker. Growth slows way down. Some of my corals like pink lemonade did seem to get better color. The polyps actually turned pink. I'm running this on icecap and cheap Odyssea reflectors.

Did you find this review helpful? Yes No


Reviewers Rating Excellent!

Posted: 6/2/2009 from HUBER HEIGHTS, OH UNITED STATE
5.0 5
Experience Level: Intermediate

Comments: This bulb provides a nice crisp whitish blue color. I am pleased with it and so are my corals. I was using the Radium 20k but the bulbs (all three that I purchased)were defective. This bulb is well worth the money as it fires quickly and does not flucuate. Burns evenly.

Did you find this review helpful? Yes No

XM double-ended 20000K 250W

Reviewers Rating Great

Posted: 4/3/2009 from RICHMOND, CA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: Great bulb for the money, however, would have liked an overall bluer tint. Requires the use of actinics to achieve this.

Did you find this review helpful? Yes No

MH Bulb

Reviewers Rating Excellent!

Posted: 3/11/2009 from YOUNGSVILLE, LA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: This is by far the best MH bulb hands down. You will not catch me with any other brand of bulb on my aquarium.

Did you find this review helpful? Yes No

XM 150W 20k bulb

Reviewers Rating Excellent!

Posted: 2/11/2009 from TAMPA, FL UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Item is exactly as ordered and the advice was spot on. I am running the bulb in a 10 gallon Nano reef tank with a current Sunpod power pack and it has a beautiful crisp white light w/ a tint of blue. My advice to you, do not run this bulb with actinic bulbs otherwise the color will be too blue.

1 of 1 People found this review helpful, did you? Yes No

of 2

Try these related products

Please make a selection 
WIN A $499 ANGEL LED! Sign up for our best deals, how-to videos and a chance to win a Euroquatics A1P Angel LED!