I believe the "double brights" are meant for FOWLR systems - not for reef.
"These LED Lights are only for Fish Only marine tanks or Freshwater low light planted tanks (crypts, anubis, java fern etc). It could also be an excellent light for a refugium system, but is not intended as a reef lighting system."
Marineland does have "reef leds": 48" - 60" 46 - white 8 -blue 3340 -lumens 48.5" x 5.25" x 1.75"
Odyssea (aqua-traders) carries a new 48" "reef led" fixture with virtually the same specs for $149.00.
(I think they copied the Marineland fixture)
fixture Size: 48.00" x 5.00" x 1.00" (Add 0.65" in height with bracket installed)
LEDs Count: 54
3340 Lumens
Super energy efficient 1 watt HQ LEDs
46x 10,000K LEDs
8x Actinic 460nm LEDs
Use 54 watts
I personally have several odyssea MH/T5 fixtures and despite what ppl say - they're usually a pretty good value. Can't vouch for their leds though.