You should be able to use the WH7 you just have to put two 24watt bullbs in series....then you will have 48 watts per red Wire.....with this configuration you can run 8 24W T5's
This has worked for me in the past with a different ballast....worth a try....and tony if you want to get some WH5's let me know I can get them cheaper with my company!!
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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