My first lights were T5, then Metal Halides which quickly became my favorite. The shimmer gave shadows and depth, gives the water life, reveals movement. Kessils are close. Do you like shimmer? or prefer shimmerless?
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I agree, metal halides can have all the par and power without that brightness that floods over into room, they give depth and sort of darkness with the brightness and shimmer.Never cared for it when I had LED's. I run T5's now and certainly do not miss it.
LED shimmer and metal halide shimmer look completely different. IMO
LoneStar, be very careful as to how high you are mounting the Kessil's from the water surface! I have 3 Kessil's on a 72" 210 gal tank and they kept going out and had nothing but problems. Maybe salt creep, or splashing from larger fish. Anyway, Kessil has been great and worked with me replacing the units but this last time they told me to send several pictures of my setup as it didn't seem right for them to go bad as they are maybe 18 months old. So, I had completely re-designed setup and now seems to be a lot better... I will take pics of what I did and also have fans to cool under canopy.