LED Grow lights vs Shoplights? What am I missing?

[stompy]

Starting to outgrow my growspace. I grow entirely underlights and have been using a LED growlight setup I got from Timber. The light is fantastic. All my plants have responded and theirs new growth everywhere (my Den aggregatum has doubled in size in 2 moths). The problem is I don't have any more room for any new additions illuminated by the lights.

So here's the question. I can buy another identical setup and be done with it. Or I can buy this LED shoplight

Parmida 2FT LED Linear High Bay Shop Light Fixture, 165W (700W MH/HID Equiv.), 21285lm, 0-10V Dimmable, UL & DLC 4.2, Commercial Industrial Warehouse Lighting, 5000K, Hanging Chain Included - - Amazon.com

Which is about a 1/3 of the price of my current lights (amd buy more plants). What am I missing? It seems like its plenty bright for a additional shelf full of Catts and Catasetums. Are the growlights that much better?