Easiest unit to match to real-life source is LUMEN because it corresponds to total light emitted.
LUX is problematic because that is total light falling on surface so it accounts the angle of spread, etc..
If you have a light bulb with 1200 Lumen in reality (like LED from Ikea), if you create same size of bulb in Corona, give it 1200 Lumen, it will give you identical light.
But even if you make the size wrong, Lumen will still give the same total illumination.
Example: 4x4cm 1200 Lumen will give the room the same total amount of light as 40x40cm 1200 Lumen. Only the first one will give sharp light, and second one will give soft light. But same total light.
Obviously, you have to account for Exposure. If the room is dark, and your light units are correct, then your exposure is wrong. Both light units and exposure are exponential, so it doesn't matter if you add EVs or double the light units, but of course, more correct (while visually identical in nature) is the first option.