Radium 20K Single End Bulb

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Radium 20K Single End Bulb

23 Review(s)

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250W Radium 20K Single End Bulb
SKU: 204580
Preferred Reefers earn 395 points
400W Radium 20K Single End Bulb
SKU: 204581
Preferred Reefers earn 405 points
  • Life Span By 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 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 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 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 on 1/14/2015

    coloration of this bulb is very good for corale maintain backward sps
  • Great Bulb By 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 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 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 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 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.