Auto-Range Light Meter, LX-113s LUX & Foot Candles, 3 Ranges

Lutron LX-113S Auto Range Light Meter, 50,000 Lux / 5,000 Foot-Candles, Separate Probe

The Lutron LX-113S measures illuminance from darkness up to 50,000 lux, or up to 5,000 foot-candles, and selects the correct range by itself — there is no range switch to get wrong. It reads in lux or foot-candles at the press of a button, and it remembers which unit you prefer, so it comes on the way you left it.

The sensor is on a separate corded probe. That matters more than it sounds: a light reading is only honest if the sensor sits where the work happens — flat on the desk, on the bench, at plant canopy height — and your body is not shading it. With a corded probe you place the sensor and read the meter from the side. The sensor itself uses a photo diode with a color correction filter whose spectral response meets the C.I.E. photopic curve, and it is cosine corrected, so light arriving at an angle is weighted the way the eye weighs it rather than over-counted.

Typical Applications

• Workplace and office lighting surveys — verifying foot-candle levels at the task surface.
• Home and building inspection, documenting lighting levels in stairwells, corridors and work areas.
• Greenhouse, grow room and indoor horticulture — checking light at canopy height.
• Photography, video and stage lighting setup.
• Museum, gallery and archive conservation, where exposure must be held below a limit.
• School, classroom and laboratory lighting checks.
• Machine shop and assembly bench task lighting.
• Parking lot, warehouse and security lighting verification.
• Comparing lamps and fixtures before and after a retrofit.

Features

• Three ranges — 2,000 / 20,000 / 50,000 lux — selected automatically.
• Light sensor uses an exclusive photo diode with a color correction filter; the spectral response meets the C.I.E. photopic curve.
• Cosine correction factor meets standard.
• Separate light sensor on a cable, so the sensor can be placed at the optimum position while you read the meter.
• Reads in lux or foot-candles, and the chosen unit is retained as the default at power on.
• Zero key function for external zero adjustment.
• Data hold function freezes the displayed value.
• Built-in low battery indicator.
• Microcomputer circuit provides high accuracy.
• Runs on a single 9V battery.

Specifications

• Measuring range: 0 to 50,000 lux, or 0 to 5,000 foot-candles (Ft-cd), in three auto ranging ranges.
• Units: lux and foot-candles.
• Sensor: exclusive photo diode with color correction filter. Spectral response meets C.I.E. photopic; cosine correction factor meets standard.
• Zero adjustment: external, by push button.
• Circuit: custom one-chip microprocessor LSI.
• Display: 44 x 29 mm dual function LCD.
• Over range indication: displayed when the reading exceeds the top range.
• Data hold: freezes the displayed reading.
• Display sampling time: approximately 1 second.
• Power off: manual, by push button.
• Meter dimensions: 5.3 x 2.4 x 1.3" (135 x 60 x 33 mm).
• Light probe dimensions: 3.2 x 2.2 x 0.3" (82 x 55 x 7 mm).
• Weight: 9.8 oz (278 g), including the light probe and battery.
• Operating temperature: 32 to 122 °F (0 to 50 °C). NOTE most batteries are not rated for use below -4 °F or above 125 °F.
• Operating humidity: less than 80% RH.
• Power supply: one 9V (006P) alkaline or heavy duty battery.
• Power consumption: approximately 5 mA DC.

Ranges, Resolution and Accuracy

Specifications apply at 23 ± 5 °C. Ranges are selected automatically.

Lux

Foot-Candles

One foot-candle is approximately 10.76 lux.

Accessories Included

• Light probe.
• Instruction manual.

Optional Components

• Carrying case, CA-52A, 7.9 x 3.1 x 2.0" (200 x 80 x 50 mm).
• Protective boot (HS-02)