150 Watt 21000K Metal Halide Bulb - Megachrome Blue, Double Ended

MB2815

This item has been discontinued.

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

Most of the MH bulbs in the same wattage format can be interchanged. However, please contact us to make sure.

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.

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


Ask a Question Earn 25 Points when you ask or answer a question
Sort By :
 
9 Questions
Displaying questions 1-9
 
 
Write Your Review Earn 25 Points when you write a review
Sort by:
 

Overall, others give this:

  • 4.5

13 Reviewers (92%) would recommend this

Overall Rating:

download image
5  Star
 10
4  Star
 1
3  Star
 0
2  Star
 2
1  Star
 0
 
5
5.0
Worth every penny

REVIEW
This bulb was the first that I have purchased for my nano. I usually try to go with the cheaper bulbs which saved me maybe $20-$30 dollars. This bulb was a major difference immediately. I would strongly recommend this if you want a super bright bulb with great blue tint. Everything in my tank res...Read More
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
5
5.0
Outstanding! - worth the money

REVIEW
I have used numerous Halide bulbs during my years of salt water aquariums. These Geismann 20,000 bulbs are amazing!! Sure, they cost more than other bulbs but $36 more than a cheaper bulb is only $3.00 / month. I have used Ushio, XM, Hamilton and other bulbs. These make the others look sick. If...Read More
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
2
2.0
Bad bulb

REVIEW
I bought two bulbs. The light being emitted from one bulb is yellow and the bulb is flickering. I was told by customer support to give it a couple of days to burn off the gasses. I may have to return it. It has been several days without change. The good bulb has a nice blue color.
Was this review helpful: Yes(0)No(0)
 
 
 
5
5.0
Great bulb

REVIEW
Bulb made an immediate difference over the off brand 14000k bulb I had been using. Corals which were browned out are now vibrant blues and greens. Tank looks awesome. It is expensive, but it's the best improvement for the money I've made to my tank. Highly recommend!
  • 1
Was this review helpful: Yes(1)No(0)
 
 
 
4
4.0
Great Color/Average Life Span

REVIEW
I love the color of these bulbs. They will give you nine months of great coloration and growth from your corals. However, my first pair shifted spectrum at nine months and needed to be replaced. 9-12 months is the expected life span of HQI bulbs. Despite the shorter life span I believe these...Read More
  • 1
Was this review helpful: Yes(1)No(0)
 
 
 
5
5.0
love it

REVIEW
I am extremely happy with this bulb. It has made huge difference in my tank with coral and acutely algae growth it has slowed algae down to where I can clean walls every few days and its still clear blue water...love the light would highly recommend
  • 1
Was this review helpful: Yes(1)No(0)
 
 
 
2
2.0
Dont Fit

REVIEW
bulbs did not fit my fixtures, and kept slipping out.
  • 1
Was this review helpful: Yes(1)No(0)
 
 
 
Write Your Review Earn 25 Points when you write a review
Sort by:
 

Overall, others give this:

  • 4.5

13 Reviewers (92%) would recommend this

Overall Rating:

download image
5  Star
 10
4  Star
 1
3  Star
 0
2  Star
 2
1  Star
 0
 

Free, Fast, and Flexible Shipping Options

  • Most products ship free—no minimum purchase required

    We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in 5-7 business days.

  • upgrade your shipping for only $4.99—free upgrade for orders $199+

    Over 90% of our members receive their orders within 2 business using UPS Ground. Upgrade from free economy shipping to UPS Ground for only $4.99—or spend $199 and we’ll upgrade you automatically!

  • need your order even faster? no problem!

    Expediated shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.

  • buy it today and we'll ship it today

    Same-day shipping is available Monday-Friday for most products—place your order by 10 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.

Learn More About Shipping

60-Day Return Period with Easy Online Returns

Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.

A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.

Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.

Learn More About Returns

Earn 5% Cash Back for Most Purchases

Rack up reward points to earn discounts on future purchases! You can earn reward points by creating an account, writing reviews, referring friends, subscribing to our newsletter, buying products, and more!

  • Most Products
    Earn 5 reward points for every $1 you spend to get 5% cash back
  • Marine Depot, AquaMaxx, Accel Aquatics, and Korallin
    Earn 6 reward points for every $1 you spend to get 6% cash back
  • EcoTech Marine, NYOS, and Aqua Illumination
    Earn 1 reward point for every $1 you spend to get 1% cash back

You can also get bonus reward points by purchasing select items during special sales and promotions.

Learn More About Rewards

Your Recently Viewed Items