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B&K Precision 615 Compact Digital Light Meter, 2 Measuring Ranges

3.0 out of 5 stars 1 customer review

Price: $109.00 & FREE Shipping. Details
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Specifications for this item
Brand Name B&K Precision
Part Number 615
UPC 817050061505
EAN 0817050061505
Item Depth 1-25/64 inches
Number of Items 1
Overall Height 7-1/2  inches
Overall Width 2-19/32  inches
Power Source Type 9V Battery
Temperature Range 32 to 122  Degrees Fahrenheit
UNSPSC Code 41115300


Product Features

  • Portable easy to use, 3-1/2 digit, compact sized digital light meter
  • Designed for simple one hand operation
  • It provides Measurement in lux and fc units
  • The meter has a backlit LCD display, peak hold (50mS pulse light) and data-hold feature
  • 1 Year warranty

Product Description

This instrument is a portable easy to use 3-1/2 digit, compact sized digital light meter designed for simple one hand operation. It provides measurement in lux and fc units. The meter has a backlit LCD display, Peak hold (50ms pulse light) and data-hold feature. Display hold. Measurement range: 20lux to 20klux, 20fc to 20kfc. Resolution: 0.01lux, 0.01fc. Accuracy: +(3 percent reading + 10 digit). Spectral response: CIE photopic. Sample rate: 2.5/sec. Operating temperature and humidity: 32 to 122 degree F (0 to 50 degree C), at greater than 70 percent RH. Storage temperature and humidity: -4 to 140 degree F (-20 to 60 degree C), 0 to 80 percent RH with battery removed. Power supply: 9V battery. Battery life: less than 200 hours typical. Measures 2-19/32" width by 7-1/2" height by 1-25/64" depth. 1 year warranty.

Product Details

  • Shipping Weight: 9.6 ounces (View shipping rates and policies)
  • ASIN: B005G5MJ8A
  • Item model number: 615
  • Average Customer Review: 3.0 out of 5 stars  See all reviews (1 customer review)
  • Amazon Best Sellers Rank: #322,908 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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By D. Etchells on May 14, 2016
Verified Purchase
I bought one of these because I needed a meter that would read down to very low light levels in our camera test lab. There are cheaper products available (we have a couple), but for a critical measurement, I trusted the B&K Precision name. As far as I can tell, the meter is accurate, and will indeed read down to very low light levels, but it's *very* slow when the light is dim. (I'm talking about levels less than 1 lux.) The spec for the meter says it updates 2x/second, and that's true as far as it goes: The digital reading updates twice a second. What's not mentioned is that there must be a huge capacitor across the sensor to reduce noise in dim lighting, so the value that's being measured by the digital part changes **very** slowly when the light level is low. At the lowest light levels we're measuring (~0.16 lux or so), it can take a good 15 seconds for the reading to stabilize.

This won't be an issue if you can afford to wait to make a reading after a lighting change (and obviously if your light source is quite constant), but if you need a faster response in very dim conditions, this probably isn't the meter for you. (It's pretty fast at higher light levels, I think it's just that in very dim lighting, the current through the photodiode is very small, so it takes a long time to charge or discharge the filter capacitor.)

(FWIW, I suspect this would be the case with other cheap light meters - or else if they have a much smaller filter capacitor, you'll get a lot of noise on the readings.)
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