Radium 20K Single End Bulb

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Why does BRS recommend this?

Radium bulbs are the most sought after single ended bulb in the reef aquarium hobby. Many successful tanks that run metal halide lights use the radium bulbs for their impeccable track record in the hobby.

  • Unique crisp white color with a strong blue tint
  • More natural "under the sea" look than other 20k metal halides
  • Typically unnecessary to add actinic supplementation with these bulbs
  • Made in Germany
  • Requires 250w HQI Ballast
More Information
Bulb Color/Temperature 20,000K
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Product Questions

What ballast do you recommend for the 400w Radium?
Question by: Scott Butcher on Feb 7, 2020, 12:28 AM
Hey there,

We really like the Reef Brite: https://www.bulkreefsupply.com/400w-metal-halide-ballast-reef-brite.html

Take care
Answer by: Thomas Billington on Feb 7, 2020, 7:37 AM
how many lumens is 400W RADIUM 20K SINGLE END BULB
Question by: Neil on Mar 20, 2019, 1:01 PM
Hey there,
Thank you for reaching out with your question. I apologize for the delay in getting back to you.
Per the manufacturer, the bulb is rated at 8700 lm.
Let us know if you have any other questions!
Answer by: William Glenn on Mar 29, 2019, 3:28 PM
Are Hamilton 250w ballast compatible with the Radium 250w?
Question by: James Wilson on Nov 26, 2016, 10:40 PM
Great question! As long as you are matching single end bulbs with single end ballasts, and the wattage also matches, they are compatible. :-)
Answer by: Randy on Nov 27, 2016, 9:37 AM
I am looking at the Radium 250w. You recommend a 250w HQI Ballast. Where do I find that?
Thank you.
Question by: Susan on Apr 1, 2016, 10:07 AM
Great question!
The Luxcore ballast currently will work with the Radium. I have included a link below!
Answer by: Connor on Apr 1, 2016, 10:35 AM
single ended means E39 mogul base
Question by: Jorge on Mar 6, 2014, 6:26 AM
Hi Jorge,
That would be correct :-)
Answer by: Bulk Reef Supply on Mar 6, 2014, 6:26 AM