You can buy an E27 halogen bulb around 50 watts (which would be around 100W incandescent) and pair it with a universal dimmer. It'd provide you nice warm light

You can buy an E27 halogen bulb around 50 watts (which would be around 100W incandescent) and pair it with a universal dimmer. It'd provide you nice warm light, and will allow to flood the space with bright light if the need arises. Neither of them are expensive. Halogen bulbs are also CRI100, so their color rendering is not different from incandescent bulbs. Turning on lights when you have ample sun is not a wise choice, I agree.