Radium 20K

[Doug]

I am running a 400 watt 20K on my normal PFO ballast. Very nice colour, but not as bright as the pics I have seen of others driving them with HQI or electronic. I have only had mine for a month, so no longevity reports yet.

I just switched some lighting around. Running a pair of 400,s on the 180. The 20K on one side and a 12K Sunburst on the other. Both driven by normal ballasts. There is no difference in the colour or the intensity. If anything the 12K is a shade less blue, but not enough to tell at first look.

The tank colour is very nice. The 170 with a pair of 175 watt 10K bulbs is not close in looks.

BUT, makes ya wonder. The 170, using 350 watts of 10K, is wayyyyyyyyyyyy brighter than the 180, using 800 watts of a higher colour bulb. To our eyes at least.