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
  • Quick Overview

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

Radium 20K Single End Bulb

96% Recommend this to a friend (22 of 23)

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250W Radium 20K Single End Bulb
SKU: 204580
$79.99
 
 
400W Radium 20K Single End Bulb
SKU: 204581
$81.95
 

Availability: In stock

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Product Questions

single ended means E39 mogul base
Question by: Jorge on Mar 6, 2014 6:26:00 AM
Hi Jorge,
That would be correct :-)
Answer by: Bulk Reef Supply on Mar 6, 2014 6:26:00 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 10:07:00 AM
Great question!
The Luxcore ballast currently will work with the Radium. I have included a link below!
http://www.bulkreefsupply.com/luxcore-250w-selectable-wattage-electronic-ballast.html
Answer by: Connor (Admin) on Apr 1, 2016 10:35:00 AM
Are Hamilton 250w ballast compatible with the Radium 250w?
Question by: James Wilson on Nov 26, 2016 10:40:00 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 (Admin) on Nov 27, 2016 9:37:00 AM

Full Details

  • 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

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Reviews

Items 1 to 12 of 23 total

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  • Life Span By Joseph on 12/11/2015

    This 400 watt light bulb is amazing needless to say and love how easy it is to light up my 93 gallon cube. I run this bulb on a HQI PFO ballast like recommended. I have had this bulb for a year and believe it has lost its power of growing corals 6 months ago. I have read many places that these bulbs should be changed out every six months and that's ok. I love the look and my corals love them. I am going to experiment and try the Megachrome Crystal SE 400 watt which was made specifically for a 400 watt HQI ballast and said to last twice as long. Its more expensive but if it lasts twice as long is it???? Looks like $25 savings every 6 months. but if that doesn't work I would gladly pay more for the Radium.
  • No supplements needed By Jeremy on 11/16/2015

    Great bulb. The only downfall is the price but I guess you have to pay a little more for an awesome bulb. Nice crisp color with some blue. I run them on Blue wave 7 ballasts. Love it. No supplements needed.
  • Good Bulb but Very Blue By Travis on 5/18/2015

    This is a very good bulb but the color is quite a bit more blue than I like. It really makes the corals pop and gives a nice shimmer effect.
  • great par By machote on 3/27/2015

    in my humble opinion this lights are the best outhere i hope they could cost less because of the leds but it seems the quality of this bulb dont allow the price to low
  • coloration of this bulb By acalderon on 1/14/2015

    coloration of this bulb is very good for corale maintain backward sps
  • Great Bulb By Collin on 6/7/2013

    These bulbs are not that much more than many of the others out there and the corals love them.
  • Extremely Blue By Brigette on 5/29/2013

    I had used "blue" and "purple" T5's before switching to Halides and this bulb gives off the most intense, blue light I've seen. It's working well.
  • Great bulb By Ray on 4/22/2013

    I ordered 1 radium to go with the 2 I already have and shipping was fast and it was wrapped very good thank
  • excellent By rhino56 on 4/4/2013

    This replaced a ushio 20k 400 watt bulb, The ushio is not a bad bulb at all, but this has a lot more brightness to it, completely beautiful color to it. I wont need any other bulbs except this now.
  • 1000w 20K Radium By Calvin415 on 3/11/2013

    Wow, this is supposed to be a 1000w bulb??? We were forced to replace our Helios 20k bulbs as they have been discontinued, but excited to find the Radium makes a 1000 bulb! That excitement was quickly extinguished once they fired up... These things are no where near as bright as the Helios we just replaced. Good color, but no where near the brightness I would expect from a 1000w bulb. :( Disappointed not only by the lack of light, but since they were twice the price of a Helios, it makes it sting even more.
  • This bulb is worth every penny! By John on 9/8/2012

    Used this to replace another 250w bulb and it's night and day difference. The corals are all more colorful and growing much better the before. The blue tint is exactly what I was looking for.
  • Best color bulbs you can get! By Matt on 7/4/2012

    At least when run on proper HQI ballasts, these give off about 270 watts of the most beautiful 20,000K light I've seen - can't beat it. On plain electronic or other magnetic ballasts these bulbs (150w DE or 250w SE) may be under-driven and give off a much more blue cast - too blue to most people's eyes.