Calculating WPG

SarahBravo

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I've upgraded the juwel tube in my new Rekord 70 to a 15W Interpet Daylight plus, and added an additional 15W arcadia tropical tube. Both have reflectors, and I've lined the inside of the hood with mylar.

The tank holds 15.5 UK gallons.

To work out the WPG, do I use UK or US gallons, and do I up the wattage to take the reflectors into account?

Or is it just 30W divided by 15.5 gallons which is 1.9 WPG?

Thanks!!
 

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