[jaidan]

Metal-halide HID lamps are best for this purpose. They have the best colour rendition of all lighting and they come in different sizes and colour temperatures.

My pick for a bright daylight would be about 6000K colour temp and I’d just throw some fittings in a room then walk outside at mid day to determine how many watts Id need to satisfy.

Bonus of these is you can get coloured lamps with more awesomer colours than LEDs.BLV is one manufacturer.

Second bonus is if you use a grow lamp in your setup, it’ll also help reduce the effects of SAD. They use the same fittings.

Oh, and remember diffusion is the key for comfortable indoor use.