How to explain day is 10 times as bright but no warmer?

Set at the present day Earth, the daylight on average is ten times as bright as today, approximately 111,000 lux at noon for example and subject to geographic and the air quality etc. I am looking for natural or man-made phenomenon that can produce super bright daylight across the equatorial region within a time frame of a couple of weeks, however the changes do not apply to luminous intensity only luminosity ideally 1,110,000 lux. Night is not affected only during the day.

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How to explain day is 10 times as bright but no warmer?

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