View Full Version : 400 Watt Radium 20 Bulbs on SPS tank

02/19/2010, 08:03 PM
Going to run two 400 watt SE 20k Radiums over a 120 using Lumenarc Mini reflctors. What ballast/manufacturer do you recommend to burn them whiter. Will plan on also having actinics

02/19/2010, 08:11 PM
I use Icecaps for mine. 400W bulbs are a lot for a 120 IMHO even with a 20K bulb. I almost feel like they are too much for my 180 at times.

02/19/2010, 08:29 PM
I use the Lumatek ballast and my 400's are not as blue as on a regular HQI ballast.

02/19/2010, 08:35 PM
I use 400W radium 20k's with icecap ballast... They are very very blue.... They look great and I also run an icecap VHO ballast and IMO that combination is to blue... Great for show but growth is very slow...

02/19/2010, 09:14 PM
Funny mine don't look that overly blue at all. Actually they look less blue (at least from my recollection) then the 250W 14K Hamiltons I used run on my old smaller tank.

No complaints about growth rate from me.

02/21/2010, 01:38 PM
I use the galaxy ballast with 400W radiums. Great combo imo.

02/21/2010, 03:59 PM
do the radiums burn whiter using that ballast?

02/21/2010, 04:07 PM
Sorry if this is a dumb question but I am thinking of buying Lumenarc Mini reflectors for SE 400 Radiums. Are the plugs that come with those reflectors universal and fit the Galaxy ballasts?

02/21/2010, 06:26 PM
i use 2-400w 20k reeflux SE MH with coralvue ballasts and have great color and growth. I also use 8x54w T5 and 2-24" VHO super actinics. All over a 120g system.

02/21/2010, 08:37 PM

02/21/2010, 08:42 PM
Just curious, if you want a white color, why are you going with a 20 k bulb? Go with a lower color temp like 14 or 12k

Grant W
02/21/2010, 08:50 PM
Snowcap I was at lumenarc today talking to Tom the owner and they can put any plug you want on the units you just need to let them know.

02/21/2010, 10:12 PM
Radiums will burn whiter and degrade quicker on HQI ballasts and the new Lumentex switchable ones . Older Lumentex's and galaxy's run them nicely . (prolly the best balance for color and longevity of the bulb imho ). All other's tend to be slightly more blue . It's just a matter of taste .

02/21/2010, 11:39 PM
I run mine on a lumatek adjustable ballast. I had it on the 400 hqi and it was to bright for my open top 93 cube now I just run it on 400 and its great.

Mike de Leon
02/22/2010, 08:05 PM
Are you guys running halide bulbs only with out supplementation? If so how are the corals doing with 400 watts?