The advantage to the 8 bulb units is that you can fine tune your colours. However, if, for example, you have just ONE Fiji Purple bulb and it starts to go off, you're really going to notice it.
Of course it also really depends on what you have in your tank. I've got SPS that was thriving under 14 month old bulbs. Go figure !
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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