Full midday sunlight is about 100,000 lux. Recommended illumination levels for office buildings are 300-500 lux. Domestic rooms will often be lit at less than 100 lux.

My workbench is illuminated to 10,000 lux, which compares to common daylight conditions. Just lighting that small area requires 120 watts of high-efficiency LEDs. Lighting the whole room to that level would require nearly two kilowatts of LEDs. Most "super strong indoor lighting" is in fact very dim compared to sunlight. We don't realise it, because our visual system is incredibly adaptable to changing illumination conditions.