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Aquarium Supplies
Home » Saltwater Aquarium Supplies  » Lighting  » Light Bulbs  » Metal Halide  » Double Ended  » 70 Watt  »  70 Watt 20000K+ Metal Halide Bulb - Ushio, Double Ended
70 Watt 20000K+ Metal Halide Bulb - Ushio, Double Ended

70 Watt 20000K+ Metal Halide Bulb - Ushio, Double Ended

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70 Watt 20000K+ Metal Halide Bulb - Ushio, Double Ended Information

Product Manuals & Documentation

We offer a wide variety of Metal Halide bulb choices to suit your aquarium lighting needs.

A Metal Halide Lamp is a high-intensity discharge light source in which the light is produced by the radiation from mercury, plus halides of metals such as sodium, scandium, indium, and dysprosium. The K at the end of color rating for each bulb stands for Kelvin. This is a measurement of the color temperature. The higher the Kelvin rating, the cooler (bluer) the color of light given off by the bulb. In general, the color given off by the 10,000K German is interpreted as being a perfect white color.

There are two main considerations to decide upon when chosing Metal Halide bulbs and systems: wattage and color temperature.
  1. There are generally two considerations when planning wattage, tank depth and the requirements of various types of corals. Tanks 18" and shorter will, typically, use 175 or 250 watt MH bulbs. Typically, tanks 24" and over will use 400 watt MH bulbs. I have found most soft and large-polyped-stony corals to do just fine within 5-15 inches from a 175 watt bulb and 10-24 inches from a 400 watt bulb. Most small-polyped-stony corals survive within 5-10 inches from a 175 watt but appear to thrive within 5-15 inches of 250 and 400 watt bulbs. These are all just general statements to assist in going the correct route with chosing wattage. They are not absolute truths.
  2. Color temperature is a hotly debated topic where there is no one recommendation that will fit everybody. Lowers Kelvin temperatures are yellower and greener colors while higher Kelvin temperatures are whiter and bluer colors. There are two factors that determine most hobbysts choice of bulb colors, par rating and aesthetics. The 6500K Iwasaki bulb is generally regarded as an excellent PAR rated bulb. However, it`s green tinged yellowish color makes for what is considered by many as poor aesthetics. This is not the say the much bluer 20,000K German bulb is aesthetically ideal. Many hobbyists complain this bulb is too blue. By far, the bulbs most popularly purchased are the 10,000K German and the 12,000K Sunburst bulbs. The majority of hobbyists choose aesthetics as the determining factor of chosing color temperature for the primary reason that the appearance of our aquariums is of utmost importance. Due to the subjective nature of color preference, we refrain from making suggestions on which color temperature is right for you. Instead, we have a visual bulb comparison of the popular bulbs on the market.
As a general rule of thumb, use one metal halide bulb for 24" of tank length. Most of the Metal Halide bulbs in the same wattage format can be interchanged. However, please contact us to make sure. Metal Halide bulbs are one the most difficult aspects of the hobby to recommend. Most of the information here is general.

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). 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

Since the North American operations began in 1967, it has been USHIO America, Inc.`s charter to provide customers with unrivaled customer service. With over 4,000 products in their portfolio, from unique specialty light sources for critically important and demanding applications, to general illumination lamps for architectural and task lighting, USHIO has earned worldwide respect as a company that delivers on its promise to meet the world`s lighting needs.
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70 Watt 20000K+ Metal Halide Bulb - Ushio, Double Ended Reviews

Average Rating
(35 reviews)
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of 4

Phenominal Spectral Output

Reviewers Rating Excellent!

Posted: 12/20/2013 from ROCKFORD, IL UNITED STATES
5.0 5
Experience Level: Expert

Comments: The color rendition is amazing and all corals have reacted positively from the 14k's I used to have to these.

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Shattered upon install

Reviewers Rating Average

Posted: 4/11/2013 from MIDLAND, NC UNITED STATES
2.5 5
Experience Level: Intermediate

Comments: I purchased two of these bulbs. So far one is working well. The other broke when I placed it in the fixture. My fault or bad manufacturing???

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great price

Reviewers Rating Excellent!

Posted: 11/17/2012 from WILKES BARRE, PA UNITED STATES
4.5 5
Experience Level: Intermediate

Comments: a truly great bulb for your money, also the best 20,000k bulb that is double ended. they do take a month or so to" break in" so they are a little white at first. i combine them with geissman bulbs and the PAR is perfect for the mix of color's

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halide bulb

Reviewers Rating Excellent!

Posted: 10/27/2012 from NEWPORT NEWS, VA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Bulb is as advertised. Color is good, temperature range of works well with my tank

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Reviewers Rating Excellent!

Posted: 7/24/2012 from CORPUS CHRISTI, TX UNITED STAT
5.0 5
Experience Level: Expert

Comments: I read alot of compaints about this bulb not being blue enough compared to the Phoenix 14K, but I am really pleased with the color in my tank. Some say it's a little purple/pink, and maybe so- but nothing overwhelming. Great bulb for the price and I'm already seeing colors improve in my Acros. :)

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

Good for stony vowels

Reviewers Rating Excellent!

Posted: 3/1/2012 from FORT COLLINS, CO UNITED STATES
4.5 5
Experience Level: Intermediate

Comments: The bulbs are bright and blue in color, easy to install but I wish they would last longer and were a little cheaper. The corals love the light but I almost lost a giant Acropora when the bulbs seem to fade out around six to seven months, I was able to make a frag before the giant died. The new bulbs package says on the side they should last longer,let's hope so, after all who wants to buy bulbs every six months. The soft corals could care less. The bulbs grow stony corals good with fast growth

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

20000K+ Metal Halide Bulb - Us

Reviewers Rating Excellent!

Posted: 1/20/2012 from Gig Harbor, WA UNITED STATES
5.0 5
Experience Level: Expert

Comments: Excellent

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Reviewers Rating Excellent!

Posted: 12/14/2011 from GREEN BAY, WI UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: The Best Bulb

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Reviewers Rating Excellent!

Posted: 12/1/2011 from APEX, NC UNITED STATES
5.0 5
Experience Level: Expert

Comments: These bulbs are fantastic. Over the years I have tried several Brands but keep coming back to Ushio. The 20,000K has some of the richest Blue and at the break of ~100 hours, they are even nicer.I feel secure when ordering from this site as I know whatever I buy will arrive in a timely fashion and the product will always arrive safely as well.

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Love this Bulb

Reviewers Rating Excellent!

Posted: 8/16/2011 from URBANA, IL UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: This bulb has a beautiful blue color. I love it, and most importantly, the corals love it :)

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of 4

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