Hey Major,
MH-300? I don't know what that is buddy. Where do u find these MH-300's? We new growers need details spelled out for us or we are just lost.
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MH-300 = Mars Hydro 300.
It is an older model but works well. You can find them all over the usual places that sell LED panels: Cramazon, Fleabay, etc.
We also have a Mars Hydro sponsor here on 420. @Mars Hydro
When shopping, keep in mind any of the smaller panels only work for a few square feet with good coverage in bloom. I'd go with one 135 watt panel per plant = about 50 watts per sq-ft.