The problem with this statement is that it fails to consider reflected sunlight. Next to the Sun, the largest source of light on the Moon is the lunar surface itself, which reflects large amounts of sunlight. At the Earth-Sun distance, maximum solar illumination is about 10,000 lumens per square foot; however, if the Sun is not directly overhead its rays will strike the surface obliquely. This decreases the intensity of sunlight per unit area. A typical Sun elevation during the Apollo landings was about 20 degrees, thus the illumination per square foot was about 3,400 lumens. Since the Moon's surface reflects about 10% of the light it receives, each square foot of surface reflected about 340 lumens. This is equivalent to the luminosity of a 35-watt light bulb. This amount of light easily explains the illumination observed in the Apollo photographs. Parla di 340 lm/ft2 cioè circa un decimo di un metro quadro, sarebbero 3400 lm/m2 con 20° di elevazione e 100.000 lm solari, io ho calcolato 3500 lm/m2 con 130.000/140.000 lm dal Sole e 15°.
Messaggio orinale: https://old.luogocomune.net/site/newbb/viewtopic.php?forum=13&topic_id=970&post_id=148184