Features

• Low-cost
• Measures from 0 to 10,000 footcandles (fc)
• Lightweight and easy-to-use
• Easy-to-read four-line display
• Timed mean calculation
• Datalogger stores up to 3000 readings
• Multiple point mean calculation via 99 measurement points
• Up to 99 file locations can be selected
• RS-232 interface
• Optional infrared printer available for printout of functions and memory content

Applications

• Light measurement in:
  • Homes
  • Schools
  • Offices
• Repro table output
• Artwork display lighting measurement
• Photography lighting measurement

The quality of light in the workplace, schools, and public buildings affects the quantity and quality of performance in workers and students. Luminous intensity must fulfill specific minimum guidelines in order to be considered good quality light. The 545 Light Meter and Datalogger is ideal for fast, easy, and non-disruptive measurement and documentation of light quality in the workplace, hospitals, offices, schools, and homes. The 545 Light Meter uses special optic filters to reconstruct the exact response of the human eye to light intensity. A light measuring cell in the meter (photo diode) converts incident light into an electronic signal that is read and displayed on the meter's LCD.

The Effects of Light Quality

Approximately 80% of sensations are experienced through the eye. For this, the human eye requires light. According to an American study, 25% of human energy is needed for the process of sight. Humans are accustomed to the light intensity available during the day (approximately 500 fc on a dreary day and up to 10,000 fc on a sunny day). Compare this to the light intensity of artificial light (between 1 and 10 fc) and you can see where the problem lies. Fatigue caused by too little light is generally experienced as systemic tiredness rather than just eye fatigue alone. After spending eight hours a day, five days a week in the typical work setting, the fatigue of too little light can cause degradation of performance.

Measurement of Luminous Intensity

Luminous intensity is measured and reported in footcandles (fc) or in Lux if using metric measurement. A light meter is sometimes referred to as a Lux meter. One footcandle is equal to the total intensity of light that falls on a one square foot surface that is one foot away from the point source of the light. When measuring in Lux, meter is substituted for foot.

Ordering Information