SDL400 is a high-accuracy light meter with built-in data logger from SVAN Analytical. Measures up to 100,000 Lux / 10,000 Fc using cosine & color-corrected silicon photodiode. Log 99 manual or 20M readings on 2G SD card with timestamps. Adjustable sampling (1–3600s), analog/digital display, Type K/J thermocouple input for temp. Ideal for cinematography, scenic design, environmental monitoring & safety checks. Fast, reliable light data anywhere. Trusted SVAN solutions since 2008.