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Extech LT40 LED Light Meter
Item #:
EXT-LT40
Brand:
Extech
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LT40 LED Light Meter by Extech
Extech LED Light meters are used for monitoring and optimizing environmental light levels in buildings, schools, and offices. LED lighting is being used more commonly, because they are less expensive, more energy efficient and brighter. Model LT40 measures the light intensity for white LED lights, while the LT45 measures both white and color LED lights.
Features
- Measure LED and Standard Lighting in Lux or Foot-Candle (Fc) units
- 4000 count display
- Min/Max Average
- Cosine and color corrected measurements
- Auto Power off
- Measures white LED lights
- Complete with built-in sensor with protective cover, 2 AAA batteries, and pouch
| Display | 4-digit LCD (maximum display: 3999) with low battery icon, measurement overload, and other function indicators |
| Sensor (detector) | Silicon photodiode with spectral response filter and cosine correction |
| Ranges and Resolution | Lux: 399.9, 3999, *39 999, *399 999 Foot-candles: 39.99, 399.9, 3999, *39 999 * Readings above 3999 use a x10 or x100 multiplier (1 Fc = 10.76 Lux) |
| Auto-range | The meter automatically ranges the display |
| Accuracy | ± (3% of reading + 3 digits) up to 500 Lux ± (3%) above 500 Lux Calibrated to standard incandescent lamp 2856°K at an ambient temperature of 23°C ±8% + 3 digits for other visible light sources |
| Angle deviation from cosine characteristics | 30°: ±2% 60°: ±6% 80°: ±25% |
| Sampling rate | 2.5 times per second (digital display) |
| Photo detector | Silicon photo-diode with spectral response filter and cosine correction |
| Operating conditions | Temperature: 5 to 40°C (41 to 104°F); Humidity: < 80% RH |
| Storage conditions | Temperature: -10 to 60°C (14 to 140°F); Humidity: < 70% RH |
| Low battery indication | Battery symbol appears on the LCD when battery voltage falls critically low |
| LED Type | White LED light can be accurately measured |
| Power supply | 2 x 1.5V 'AAA' batteries |
| Battery life | Approximately 200 hours |
| Auto Power OFF | Meter switches OFF after 12 minutes of inactivity |
| Dimensions | 133 x 48 x 23 mm (5.2 x 1.9 x 1") |
| Weight | 250 g. (8.8 oz.) including batteries |
