The winter time is the worst. There is almost no sun here, only dark Grey skies. I'm treating myself daily with artificial light in my office room. I bought a 5xE27 photography stand and I've put strong light bulbs with high CR rate and a lot of lumens. They have different warmth so they cover the entire light spectrum. This lamp is pointing to the ceiling giving the light a nice spread.

Additionally, I have two e27 light bulbs behind my monitor screen, one monitor light pointing at the desk.

Finally, two plant light bulbs that are giving the energy to my Monstera and other plants. It helps only a bit, but we have to try whatever works :)