A simple light level meter that gives a very accurate and helpful visual aid. Common Light Levels Outdoor. Condition Illumination. Sunlight 10000 107, 527. Full Daylight 1000 10, 752. Overcast Day 100 1, 075. Very Dark Day 10 107. Twilight 1 10. 8. Deep Twilight. 1 1. 08. Full Moon. 01.