How long ago was your last tank? The current wisdom is that we don't need as much light as what was touted before. Instead, balance the nuitrients and of course our old friend, CO2. Also the larger the tank, the lower the so-called WPG, as WPG does not scale with tank volume.
Nowadays very few people use MH. LED is the new trend, but some are still sticking with T5. Later, I'll embedded a few YouTube videos by an AQ member that gives good overviews of lighting for planted these days.
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