Amazon.com : ANNMETER Light Illuminance Meter, Digital Luxmeter AN-8801C Measures 0-40,000Lux/ Footcandle with Separate Lumen Sensor, Lux/FC Lights Tester for Plant LED Office : Electronics
Amazon.com : LumiaStar 4X2Ft 200W LED Grow Lights with VegGrow Spectrum and Over 2.0 PPF/W and 40000 Lux, Great for Retrofit T5 4Ft 8 Lamp Fluo. and 600W MH Grow Lights, Grow
Extech® EasyView™ 4-Range 40,000Fc & 5-Range 40,000Lux Light Meter - 176399 - Northern Safety Co., Inc.