they are both blue bulb and not 20 k but people in the industry call them 20k butt no they are not the same bulb and look totaly different inside and outside
I try a radium 20k on a agro ballast beside a hushio 20k on a m59 ballast on my reef they both look very nice
the radium is brighter and less blue but is give less fluorescence to coral
I have to admit I have found the hushio very very nice color even nicer than the radium
for the intensity I found the hushio more dim with the eye but have not tested with any meter
By the way the hushio dont have a blue glass
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