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50% of T5 lighting is based on the design and quality of the reflector in use. There's only two fixtures that have caught my eye, which would be Tek or Aquatinics. Since your using a retro, these fixtures are a moot point. I would only use Ice Cap or Sunlight Suppy T5 reflectors. The ones in your picture seem to missing the "M" shape parabolic design.
The 54w retro kit would fit, the bulbs are not truely 48". From endcap to endcap, it's about 47" and your canopy should be 48" to 49" on the inside since it needs to sit outside of your tank rim.
You should stay with a 54w retro either way that you choose. |