General Purpose Digital Photometers (Lightmeters / Luxmeters)

Megatron closed down operations at the end of February 2010. OTC provides these Megatron pages for information only.


megatron DL5 & DL3
Megatron DL5 & DL3
megatron DL3/L & DL3/LC
Megatron DL3/LC & DL3/L

Correct lighting levels are needed not just to conform with health and safety regulations, but for comfort and efficiency when working, playing or relaxing; they are needed for watching sport, or viewing pictures where too much light may cause irreversible damage to works of art, and too little may prevent one from seeing them properly. The Chartered Institution of Building Service Engineers in the CIBSE Code for Interior Lighting and other publications gives recommendations for most specific interiors and activities, as well as summarising the main legal requirements such as the Health & Safety at Work Acts and the Offices, Shops and Railway Premises Act 1963. These meters are suitable as WHITE LIGHT METERS as they are virtually insensitive to U-V light.

The Megatron digital photometers (also known as: lightmeters, illiminance meters, luxmeters, brightness meters, white light meters)are portable lightweight instruments versatile enough to measure street and security lighting, office and factory lighting, flood lighting, daylight and sunlight. The DL3-5266 has been specially developed to satisfy the requirements of British Standard Code of Practice BS5266 Part 1 for Emergency Lighting. The accuracy and reliability of the meters make them suitable for such people as conservationists, lighting engineers, and those concerned with animal husbandry, for checking and developing systems in museums and galleries, sports stadiums, offices, hospitals, defence establishment, workshops, breeding and hatching areas

All the DL and DA photometers use a TYPE M photocell in a cosine correcting mount. As the type M is a colour correct cell, correction factors are not needed - see the Graph and Table of Spectral Response. The DL3 and DL5 photometers use a flat mount which also allows these instruments to be used for luminance measurements from internally lit signs, VDT screens and lighting fittings.


DL Photometers - Ranges, Weights and Dimensions

Model Reference DL3 DL3/C DL3/L DL3/LC DL3-5266 DL3/H DL4 DL5
Light Ranges
Lux		 Step Size
Lux		 
 
 
 
 
 
   
 
 
 
0 - 100 000
 
100
  *   * 
0 - 50 000
 
100
             *   
0 - 10 000
 
10
 * *       *   * 
0 - 5 000
 
10
             *   
0 - 1 000
 
1
 * * * *   *   * 
0 - 500
 
1
             *   
0 - 100
 
1
 * * * * *     * 
0 - 50
 
0.1
             *   
0 - 10
 
0.01
     * * *     * 
0 - 1
 
0.001
         *       
Weight                                   kg
                                             lb-oz
 
0.29
0-10
 
0.37
0-13
 
0.29
0-10
 
0.37
0-13
 
0.37
0-13
 
0.37
0-13
 
1.3
2-4
 
1.3
2-4
 
Illuminated Display
     * * *   * * 
Length of Lead                  metre
                                                   in
 
No
Lead
 
2
79
 
No
Lead
 
2
79
 
2
79
 
2
79
 
2
79
 
2
79
 
Dimensions
                                                  H
                                                  W
                                                   L
 
mm    in
35    1.4
85    3.3
145   5.7
 
mm    in
35    1.4
85    3.3
145   5.7
 
mm    in
35    1.4
85    3.3
145   5.7
 
mm    in
35    1.4
85    3.3
145   5.7
 
mm    in
35    1.4
85    3.3
145   5.7
 
mm    in
35    1.4
85    3.3
145   5.7
 
mm    in
80    3.5
140   5.5
300   11.8
 
mm    in
80    3.5
140   5.5
300   11.8
 
 

The DL5, the DL3/L, the DL3/LC and DL3-5266 photometers are fitted with display illumination to enable the meters to be read under low lighting conditions. There is a cut-off switch fitted in the corner of the panel of the DL5 to save the battery if the instrument is put away without being switched off.

All the photometers are fitted with a low battery indicator on the display. They have a Hold switch for holding the reading, so that it can be taken later. This can be useful under low light conditions when the display illumination is not wanted (or available as on the DL3), or when for other reasons (such as a confined space) a direct reading is not convenient.

The DL3 photometers are much lighter and more compact than the DL5 or DL4 and still cover a very wide range of conditions as shown in the table above.

Price List

megatron - for measuring light
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