A corner of my music room has been designated as indoor greenhouse. I nuture my tropical bonsai trees here all winter, but recently I've begun seeding for spring crops. The shelving unit (above left) is commercially designed with three shelves and adjustable lights so I can lower the lights over new seedlings. I have wrapped the unit with reflective bubble insulation to keep out drafts and hold in a little heat.
My second shelving unit is a cheap wooden unit from the home supply store. We upgraded the lighting a year ago to Flouro-Wing grow lights. These units are so bright that I shelter the room from the light with a room-dividing screen. Yes, I think the upgraded lights are more effective than regular shop lamps, but any light works so don't let this limit your gardening goals. I've wrapped this unit with insulation, too.
My onion and scallion seedlings are up but struggling. I've just sowed seeds for basil, parsley, spinach, kale, shallots, carrots, Brussels sprouts, and Swiss chard.
And now I can hear the chickens squawking. Off I go......