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Can someone tell me what RIU is so that I can check this out newbi here thanks

Can some one help out here I have a 3x3 flood table which is actually 36 x 36 x 7 under a 1000 watt MH conversion bulb with a hood. I also have a 400 watt MH that Im not using at all I also have a Secret Jardin DR150 Technical Info : - Size assembled (cm) : 150 x...