Light  intensity is a big player in the game of growing. Knowing how much your plants are receiving can make the difference between average and high yields. Find those ""dark"" spots with a digital light meter and you can make the necessary adjustments - maybe you need to add another light or sometmes you may even have too much light..yes there is such a thing!
 
Specifications
 
LCD Display : 18 mm (0.7 inch) LCD
Measuring Range: 0 ~ 50,000 Lux. over 3 Ranges
Over-input: Indication of ""1""
 
Accuracy :
 
0 ~ 2,000 Lux : ± (5% + 2d)
2,000 ~ 19,990 Lux : ± (5% + 2d)
20,000 ~ 50,000 Lux : ± (5% + 2d)

Sampling Time :
 
0.4 second
Power Supply: one 9V battery (included) , Consumption current approx 2 mA
Dimension: approx. 118 (L) x 70 (W) x 29 (D) mm (4.6' x 2.7' x 1.1' inch)
Weight: approx. 200 g (included battery and carrying bag)"