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  1. #1
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    20K Ushio 400 watt MH

    Has anyone used or seen the 20K Ushio's yet? I was wondering if they are a tad less blue or more blue than Radiums. Any Pictures?? Please post.

  2. #2
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    They are about as blue when run on the same ballast, however, the Ushio seem to have more of a blue coloration as opposed to a bluish-violet to my eye at least. I would say that the two look very similar. When looking at the spectral signature, the ushio has a peak at 410, 450, 547, 575, and the radium has a peak at 450. The Ushio appears to have more actinic light according to some sources. All in all, it really is a close draw. Current research shows that increases in blue light lead to more blue coloration (reflection), so the radium may be a better bet for coloration. Although, as a standalone, the Ushio may give better growth. It's tough to tell without some good studies...

    I would say that all together, they are pretty similar lamps.

    -Perry
    Sunlight Supply, Inc.

  3. #3
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    Thanks Perry,

    Chris

  4. #4
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    I have four Ushio 20,000k 400 watt lights on my tank and I really like them!!! They are alittle more blue than the radiums. I am comparing my Ushios against a friend who just install 400 watt Radiums. Now he is using the PFO HQI ballast and I use PFO regulator ballast. I also use 2 400 watt 6,500 k sakis too! If I was just using the Ushios they IMO would be too blue-----I would use the radiums!
    Jim


 

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