Category : Optics (components, coatings, instruments and systems) > Optical instrumentation, systems and accessories

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"New Lightmeter from Megatron for Emergency Lighting
Megatron has introduced a new lightmeter with ten times more sensitivity than any previous digital meter on its standard range. The DL3-5266 luxmeter is specifically designed to meet the requirements of
BS 5266-1:1999. This British Standard* is a code of practice for the emergency lighting of premises other than cinemas and certain other specified premises used for entertainment. Annex A is on measuring the illuminance of emergency lighting, and includes the following requirements for the ligh meter:

Good cosine correction as a large proportion of the light falls obliquely on the surface being measured.
Sufficient sensitivity to measure the very low levels of lighting sometimes involved - a minimum resolution of 1 mlux (0.001 lux) and covering a maximum up to at least 100 lux.
A sensor remote from the readout is preferred to reduce the danger of shading the sensor as readings are being taken.
The ability for the meter to be read quickly as emergency lighting often varies with time.
The DL3-5266 luxmeter has excellent cosine correction, resolution down to 1 mlux (0.001 lux) with a maximum reading of 199.9 lux; the sensor is on a 2m cable, or it can be used for making an initial assessment in situ as shown in the photo. The large digits and discrete backlight make it easy and quick to read. There is a hold facility that can be helpful under very low light conditions, or in awkward positions were the display is not easy to read.

The DL3-5266 has the following three ranges:

0 - 1.999 lux - resolution 0.001 lux
0 - 19.99 lux - resolution 0.01 lux
0 - 199.9 lux - resolution 0.1 lux

It is based on our well-proven DL3 range of meters with Megatron Type M colour-correct sensors, calibrated to standards directly traceable to the National Physical Laboratory. They are reliable robust instruments, supported by our efficient calibration and maintenance service. Although the DL3-5266 luxmeter was developed for emergency lighting, it is also suitable whenever very low lighting levels need to be measured accurately.

*BS 5266-1:1999 is available from: BSI, 389 Chiswick High Road, London W4 4AL"

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