Which Size T5 Luminaire / Wattage?

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smithyithy

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I'm in the process of ordering my custom-built tank, which is going to be 32" (890mm) wide.
 
I'm looking at the Arcadia T5 Luminaire lights to mount to the tank.
 
The problem is with which model to get:
 
AM224F: 'fit tanks of 651mm to 800mm in width' - 2 x 24W 
 
http://www.aquaessentials.co.uk/arcadia-freshwater-ot5-luminaire-2-x-24w-32-p-5765.html
 
AM439F: 'fit tanks of 801mm to 1000mm in width' - 2 x 39W.
 
http://www.aquaessentials.co.uk/arcadia-freshwater-ot5-luminaire-2-x-39w-40-p-5766.html
 
My concern is that I was originally getting a 30" (760mm) wide tank, but now I can have it a bit wider, I'll need the longer lamp, which is a big step up in wattage. The tank will work out to around 35 gallons (~132 litres), heavily planted and running CO2.
 
Just worried that I'll be over-lighting it. I've also gotta pay £25 more for the bigger lamp but that's a result of wanting the inch-perfect tank lol
 
Any advice welcome, thank you.
 
Chris.
 

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