I have the 48" Giesemann Infinity on a 32" wide tank, which it covers easily. The Infinity uses the DE bulbs compared with the SE on the Spectra. Personally I prefere DE bulbs.
Like many things in life "You get what you pay for" and it's hard to find fault with the Giesemann fixtures. Quality lighting is one of the corner stones to a great reef system, so in other words don't skimp on the lighting, I didn't and I'm glad I spent the extra cash on a quality system.
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