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1. CScale mode in this mode the minimum Intensity is Black and white the highest 3 colour temperature Viewer LuxMeter Pro calculates the color temperature of the captured image not to be confused with the color temperature of the light source The color temperature calculated from LuxMeter Pro is that derived from the dominant media present in the image in a nutshell LuxMeter Pro analyzes the colors present and find the white point of the image using the reference table CIE D65 with white point set at 6504K The value then does not express white light used to illuminate the object but the result depends on the composition of the colors in the object illuminated This means that the calculated value may fluctuate depending on the dominant in the area affected by the measure For example if the image contains only one color LuxMeter Pro in color space conversion from RGB to YXZ fails to achieve the correct white point value because the colors in the image does not have the coordinates need to be able to calculate this value In this case we will return a LuxMeter Pro temperature value which is the dominant color which might be close to 2000 k for images with a predominance of red or which tends to 8000 k for those with a prevalence of blue In order to obtain a correct temperature you can put inside the frame a white object such as a sheet of paper or do enter into the frame other items of different colors in a way that LuxMeter Pro to calculate th2. addition to the type of filament lamp chosen the amount of free memory on your device and the reset button to reset all Default values 9 HOW TO MAKE A MEASURE Measure Process Let s see how you can use LuxMeter Pro to make a measure of illumination of an environment Consider a closed environment such as an Office lit with fluorescent tubes mounted on the ceiling as shown in the figure below i gt i N 4 V pr i a MP ay i EN gt 4 f We want to assess the overall lighting of the Office i e all 4 lamps that illuminate the entire space below the first thing to do is select the type of lighting used in this case the FLUORESCENT TUBE Press the selection button of the typology of lamps Select the type fluorescent tube As a standard value the fluorescent tube has a Viewing angle illumination angle of 180 which can be modified if necessary through the appropriate slider Viewing Angle The next thing is that you set the power of the lights installed in our Here are 4 lamps each one with 2 fluorescent tubes from 45W so we 45 W x 8 360 pipes Watt installed This value must be set with the slider marked Light Power Watt sliding panel The last phase of Setup is to set the distance of the light source from the illuminated area In this case knowing the ceiling height which is 2 5 meters above the average value between the sources and the area below may be approximated to 2 05 2 10 m T
3. from scans all areas which have a much darker colour than the rest which could mislead the Viewer Compare the pictures capture in three different ways in order to understand how LuxMeter Pro interprets the data collected by the camera GScale Normal 155 9 Ix Eon Lux 4 01 a a Lux 311 89 Temp 5048K E Temp 5032K on Tube 72W 4320 Lm ll Neon Tube 72W 4320 Lm Source Dist 1 62 mt Source Dist 1 62 mt 2000K 2000K Fig 22 12 11 Comparison of three images can be seen as LuxMeter Pro highlights areas with different light intensity as CScale mode in GScale dark colors can fool the process giving a result that is not trusted as seen in Fig23 where the target appears black although located in the zone of maximum exposure SAVE MEASUREMENTS ND DB SAVES Save Measure DB During a measurement you can save all acquired data including color temperature chart and preview mode The rescue work is enabled by the SAVE button and generates an image file with all acquired data You must enter a name for the Save and the data will be stored in the application folder in Documents SaveData accessible from iTunes when you connect the device to your Mac PC It is always possible to access saved measurements and using the DB button The DB form presents a list of all saved measurement as shown in Fig 25 in the list of saved measurements are visible measurement data is a miniature of the captured image From this form yo
4. 0 lumens Daylight in shade 25 000 lumens Direct daylight 32 000 lumens Direct sunlight 130 000 lumens 4 DISTANCE TO THE LIGHT SOURCE Source Distance The distance of the light source from the illuminated area is important for the correct measurement of lighting let s see what are the conditions of proper measuring and how it should be set in order to work Pro LuxMeter optimally Figure shows a simplified diagram of a possible KAANT LuxMeter Pro is the minimum distance from the SOURCE DISTANCE source to the surface or illuminated object the Fig 2 5 mt image is marked by the red arrow Distance mt 338 5 condition as you can see the iPhone is pointed toward the illuminated area and not to the light in this case the distance to set parameters The distance of the light source it must be set in the LuxMeter Pro main screen by moving the Slider Distance mt or by entering the value manually by tapping the icon that depicts a hand u next to the slider thus enabling the input mask manually 5 TAPER ANGLE OF ILLUMINATION Viewing Angle Normally the light sources particularly as except in LEDs light is radiated into surrounding space at the source Usually the light sources are placed on walls or attics and under these circumstances a portion of the light is obscured from the wall where the lamp is placed that is why the lights that do not have a reflective screen or a projecto
5. E Light Type We see in detail the types of sources used in LuxMeter Pro Advanced 9 Incandescent lamp S Common lamp filament with power ranging between 5 and 500 Watt with color temperature about 2400K Light source with low yield n 15 R Incandescent lamp halide Filament lamp with power ranging between 15 and 1500 Watts with about 2600 k color temperature Light source with low yield n 20 Hot cathode fluorescent tube the fluorescent tubes have a power ranging between 18 and 65 Watt bulb with a color temperature which varies between 2700 and 4500 K Light source with decent yields n 60 LED LED Light 0008 ed lamps provide capacities between 10 and 70 Watts With a color temperature of approximately 6200 k Discrete performance light source n 60 Quartz light Quartz lamps provide between 90 and power 450 Watt With a color temperature ranging from 4500 to 6500 k Light source with Good yield n 87 Light high pressure sodium Sodium lamps provide powers between 250 and 800 Watts With a color temperature that ranges from 30000 to which Light source with high yield n 117 Light to low pressure sodium Sodium lamps provide powers between 250 and 800 Watts With a color temperature that ranges from 30000 to which Light source with high yield n 150 Sunlight Sunlight provides an intensity of light varies depending on weather conditions with values that correspond to the following table Cloudy 10 00
6. LuxMeter Pro Advanced DIGITAL LUX METER m m x S l q 9 a MANUALE UTENTE INDICE INTRO DOC Ne 2 HOW DOES LUX METER PRO WORK Base LOGIC s s s ssrssresrssrssreorenrnsnssnesnronnsnrnnonnonsnnnsneonnonnsnrnnronnnnnnnnnntonnnnnnnnnnnonnnnnnnnnnnnnnnnnnnnnnn nenna 2 PGT SOURCE EON EEE EE 3 DISTANCE TO THE LIGHT SOURCE Source Distance rrsersvrsvvnsvrsvrnvennvnnvnnvenversvsnvenvesnvenvenvessvenvenvennvsnvennennennvenvennenevennennensvennennennenenenn 4 TAPER ANGLE OF ILLUMINATION Viewing Angle sssssssssssssssssssssssscscsesssessscscecscscsessesssessscscecssessssscarscaressesessesatararetaeessesseanaeens 5 SOURCE POWER EXPRESSED IN WATTS Light POWET scscsesccstissscdaisedessassschsiteialsnudatavches UecwnsdancinsdaiiedunceuebcdssncutdebeyesGd edentdeheunttetodesesestans 6 TIN DUNE IID E E AS A cote tend EAA A ES V AETA AAE A 7 SETTING SLIDING PANEL Slide up Settings Panel csssssssssssssssssscsssssssssssssscscsessssssssescsescscsessssssssescscecessesseseacauscsssesssessatarseeseees 9 HOW TO MAKE A MEASURE Measure Process wccccccicccicesincsevatcececaccsecealeweicdenscvwssseckitslacsabslcacenus foseutewsiisuiiccabesvevacouhisbeanasseracedlensunctvece 10 PREVIEW MODE Perview Mode u cesssscesssssssecceesesssscssssecsecsecsecsececsecsscsceaccasesecsecaecaceaecaecasssecaecassaecascasenseaseassassacsassassacseceassaseneaessassnseneasss 11 SAVE MEASUREMENTS ND DB SAVES Save Measure DB i msmsesssrsrsrsev
7. alues DB button opens the list of saved measurements see paragraph 11 Change the camera used by the back to the front and vice versa A Open the form of the type of setting the lamp used in the Fluoreecgpi tue measure to select the just touch a lamp by sliding fig 11 checklist Iz amp hel t tinie A VIFWANGI F AUTO Q 5 3 The new AutoGain function is useful when the camera gain setting is incorrect the Auto Gain calculates the correct value of Gain using as reference a lamp with known characteristics see section 12 SCALE The SCALE function changes the underlying value scale by multiplying x 1 x 10 x 100 and x 1000 scale of measurable values see paragraph 14 i This button opens the LuxMeter information Mask Pro Advanced 8 SETTING SLIDING PANEL Slide up Settings Panel Running with his finger upwards starting from the buttons Panel displays the settings panel In this Panel you can set the parameters of the light source as the lamp power in Watts and the illumination angle in degrees and the parameters of the camera Gain Gain and Offset Distance mt m r Viewing angle ul arm NB ra gt Side UP 7 g Side uP ae Lamp 40W 600 Lm oa ws owe os m 7 Light Power Watt AUTO 9g _ A GAIN JOCALE ga De AMPS Offset RESE FREE RAM 1175MB Viewing angle AutoGain Setting i Incandescent Lamp 154W 2307 ER Queued the sliding panel is displayed in
8. as close as possible to the real one It should be kept in mind that the light intensity attenuation increases with a value equal to the square of the distance this means that even a few inches of difference can result in large decreases in the level of illumination This phenomenon can be seen by observing the effect of a lamp placed at different distances from an object we realize immediately that as well as the lamp the same power and then the same luminous intensity this illuminate with different intensities depending on the distance from which the object is located The type of lighting is available from the source used which can be of various kinds for example an incandescent lamp a fluorescent tubel LED etc the type of lamp is indispensable in order to ascend LuxMeter Pro lighting efficiency is the value of transformation from Watts to LUMENS which differs from type to type based on lamp technology It is understood at this point that the value in Watts is required to determine the value of the lamp LIGHT or group of lights used The lighting angle is the angle of the cone generated by the projector used by the source this value is present in lamps which focus the beam of light in one direction type lamps PAR LED lamps and all the lights that have a worm or a reflective screen in other cases where the source illuminates the surrounding area in all directions is regarded as illumination angle an angle of 180 3 LIGHT SOURC
9. e correct coordinates of the color components in the image In the color temperature value in addition to the numeric value is also a chart with the histogram of the Figo distribution of the components of whiteness On the left were If you have a high concentration of hue in this fraction of the chart means that converge toward temperature values from 2000 to 4000 k the central part namely related to white as we mentioned earlier takes temperature values around 6500 k CEI D65 and therefore the right of the graph shows the concentration of the components that go into the blue with temperatures up to 10000 k side of the chart are the shades that converge towards the red component of the warm light 4 Control Panel In Control Panel contains buttons that allow access to some functions of LuxMeter Pro In order we have the following functions Upload from photo library allows you to analyze a picture in the library Return to LIVE mode with the use of the camera HOLD Temporarily freezes the screen leaving the last value when it is active in the display appears the symbol fg eJapii Enables and disables the camera s white balance this function is useful if the area to be analyzed has dominant colors that may affect the calculation of colour temperature When the function and activate icon appears in the display TE 3 re WA gt 7 The SAVE Function lets you save the current measurement with all its v
10. erevrvrvrnenensvrnsnenenenrssvsnenensssnsnsnenesrssssssssnsssssssssnenssssssenenene 13 AUTOGAIN CAMERA CALIBRATION Camera AutoGain ssrsrsrsrsrsrsvsvsvsrsvnvsrsrsrsrsrnssrsrsrsrsrsrsrsrsrsrsssrsrsrsrsrsrsrsrsrsrssersrsrsesessersrsrsenses 14 CALIBRATION WHIT COMPARISON TOOL LuxMeter Compare r rnrsrsvsvsnsnrnrnrnrnvsnrnnvsnrnravnvsrsnenrnrnrnenrnennsnsnsnrnrnessnenrsrnenenenrnenennn 15 SMEEING SN ncee darned needa hve fuera acini ante nabalaereieiaaaennenens 15 MOT EE N N cn ee a V VANE tac tata cca enhance ead E 16 Ver 1 0 0 INTRODUCTION LuxMeter Pro is an Advanced application for iPhone and iPad which uses the internal camera to calculate in real time the level of illumination of the image captured by the camera It should be noted that the camera does not work like the brightness sensors used in traditional light meters which measure the level of incident light but in this case LuxMeter Pro measure the light reflected from the objects present in the area shown by the camera This substantial difference makes the use of this application totally different from classic light meters and it is also not possible to perform the measurement of light emitted directly from the light source Pointing the camera at a lamp directly this would be dazzled it by providing an image not be used for the calculation of lighting There is also another very important factor which implies the proper functioning of LuxMeter Pro Advanced that is to use a whi
11. hades of color areas with different light intensity Areas with less brightness will appear in blue and Red will be brighter Here is a demo that shows how image LuxMeter Pro discriminates against various areas with different light intensity 11 Je NG e 17 02 100 4 As you can see in the image to the left LuxMeter Pro Advanced iPhones LuxMeter Pro view preview screen even a Version 3 5 AWB scale of colors with brightness values the ILI CE Distance mt 52 Gain Zi ie particular condition in this example you Lux values refer to the minimum and maximum X I value measured in the image captured by the camera But we must pay attention to a can see an image where the walls and ceiling are white while on a wall there is a door that LuxMeter Pro depicts with color proffer Anyone following the previous reasoning and referring to the scale of colors visible on the left might think that the area affected by the door has a lower luminous intensity despite being in the area of the wall where the intensity is higher as is visible from the surrounding red In fact even if the target is illuminated with the considered darker than for the simple fact that is same intensity in the area environment is Brown and compared to wall white reflects much less light tricking so LuxMeter Pro In cases like this it s always best to make a comparison with the captured image into normal mode and exclude
12. he button placed on the main screen buttons Panel ple The new AutoGain function requires the use of a light source with known characteristics and a blank sheet of paper The calibration procedure is to set correctly the parameters of the light source and tap the button AUTO GAIN button to start the calibration process focusing the camera on white sheet illuminated by the light source In Figure 27 is an example of possible camera calibration using a desk lamp by mail 15Watt at a distance of 60 cm from the paper ampada 15W igangle Nella schermata di preview di LuxMeter Pro deve essere visibile tutto il foglio bianco in modo da riempire la schermata per circa il 10 Distanza 60cr Fig 27 13 CALIBRATION WHIT COMPARISON TOOL LuxMeter Compare If necessary make a manual calibration by comparison with a sample LuxMeter the procedure is similar to that of only the new autogain value of gain should be set to manual until you get the same value provided by comparison tool Specifically the comparison tool sensor should be positioned on the white sheet or adjacent to it so as to be illuminated in the same way as the paper itself and the value that appears to be the same that we get from LuxMeter Pro by modifying the Gain value as shown in Figure 28 Fig 28 14 SCALE SETTING Scale Depending on the type of measurement to be made you can change the full scale value of the display using the SCALE button on the main sc
13. his value 10 is inserted in the main form of LuxMeter Pro via the slider Distance mt At this point it is sufficient to point the camera of the iPhone iPad to the area to measure trying to display within the preview pane the affected area as seen in the example image we should have a situation as shown in the example below Nessuna SIM 13 18 100 Gi 4 iPhone5 Version 3 5 FI TILT Distance mt 44 Gain cit ee LuxMeter Pro Advanced rn ema 10 PREVIEW MODE Preview Mode If all parameters are correct and the Gain of the camera is set correctly the display will show the value of consideration of overall lighting in Lux Of course if you move the camera to a different zone we ll have to reconfigure the parameters that have been changed such as the power of the lights and or the distance of the source In case the lighting parameters are correct and the value calculated from LuxMeter Pro is not plausible you may need to recalibrate the camera s Gain The calibration procedure is described in section 12 Auto Gain In order to get a detailed view of the detected light intensity in the various area affected by observation you can enable in addition to standard mode as mentioned at the beginning of this document other two modes called CScale Color Scale and another GScale Gray Scale Specifically the CScale mode reprocess the image captured by the camera by replacing with different s
14. r must be set with the value of the lighting angle 180 The lamps without reflector and projector are without illumination angle Viewing Angle 180 Viewing angle AutoGain Setting Incandescent Lamp 154W 2307 Lm z hd Fig3 Fig The parameter Viewing Angle must be set in the settings panel of the LuxMeter Pro using the Slider or by entering manually the value In order to get a better yield of light is possible through a screen reflecting or parabolic projectors convey the light produced from the source in one direction creating a cone of light that will illuminate the area or object concerned Based on the structural characteristics of the shroud the light cone can have different lighting angles as shown in Figure 5 In this configuration all the light is conveyed in one direction thereby improving the ability to source lighting low power used As for the previous example the lighting angle value must be set in the settings panel of the LuxMeter Pro using the Slider or by entering manually the value of the angle Fig5 6 SOURCE POWER EXPRESSED IN WATTS Power Light The value in Watts of power of the light source is used by LuxMeter Pro to calculate the equivalent Lumen brightness depending on the type of lamp used and its coefficient of lighting N l The value in the lumen of the source or and of the sources is given by the product of total power in vts X For example if in an environment there is only one light
15. reen buttons Panel The Scale button changes the scale factor between 4 options x I maximum 999 9 Lux x 10 maximum 9999 Lux x 100 maximum 99999 Lux x 1000 maximum 999999 Lux In the case of off the charts on the display you will see the following value flashes fig 29 mn GN GN aa Out Of Scale Fig 29 15 15 NOTE
16. source simply locate its power usually found printed on the lamp itself and enter the value in Lux Meter Pro Advanced Some examples of visible Power on lamps 7 PHitiers MASTER Liane 25Watt halogen lamp _ Halogen lamp with 18 Watt fluorescent integrated projector from tube 75 Watt Fig 6 Fig 7 In case there are multiple environment lamps the value to set in the LuxMeter Pro will be the sum of all lamps are turned on simultaneously 7 MAIN MEN Nessuna SIM LuxMeter Pro Advanced JL Distance mt U 13 17 100 E iPhone5 Version 3 5 var am Lux Mes X I 7 a LILI E a2 I ILI O A 2 After giving a look at essential data to operate now analyze main menu structure and functions contained therein Let s start with the most important elements Lux Value 1 returns the maximum value of the illumination measured by the camera the value is expressed in Lux lumen m 2 Preview preview shows the processed image from LuxMeter Pro and you can select the display mode between normal that shows the captured image without elaboration CScale that displays the image in a variety of colors depending on the light intensity present in that particular part of the image the color pra scale goes from dark blue red brightness detected METTE i minimum maximum brightness GScale that consists in the view of the processed image in grayscale as for
17. te target areas where black or prevails particularly dark tones are present into environments In the case of dark or black objects or areas with a predominance of dark object you must enter a target blank object because black objects do not reflect light preventing LuxMeter Pro to be able to analyze the lighting intensity The white target could be any white object that occupies 30 minimum of the illuminated area in areas with objects of various shades LuxMeter Pro automatically calculates the value of medium gray and its lighting without the need to target white HOW DOES LUX METER PRO WORK Measure Process LuxMeter Pro Advanced being an application and not a specific device in order to ensure a reasonable accuracy in measurements requires some precautions The first thing to do before the measurement is to correctly set the parameters for the type of lighting so as to make it possible for the correct setting LuxMeter Pro of the gain of the camera and the parameters of calculation of luminous intensity Considered that light follows a series of physical phenomena to which attention must be paid Required parameters are Type of light source Source distance from the illuminated area lighting Cone Viewing angle in the case of headlamps or LED lights or 180 Wattage of the light source The parameters above are usually available on light sources except for the distance from the area to be measured or estimated to be trying to get
18. u can view the measure with all of its data or send it via email by entering as an attachment to the saved image An example is shown in Figure 26 Nessuna SIM 12 34 Nessuna SIM 12 35 52 Es LuxMeter Pro Advanced Annulla LuxMeterPro Advance Saved Mesure gt Oggetto LuxMeterPro Advanced color 25 10 2013 15 05 Lux 272 01 E Source Dist 1 00mt Tmp 5247 K li gt Incandescent Lamp 154W 2307 Lm DESGRIPTION color Lux 301 06 26 10 2013 00 06 Lux 389 88 Temp 5048 K S Dist 1 00mt Tmp 4911K incandescent Lamp 154W 2307 Lm ama Neon Tube 72W 4320 Lm E Source Dist 1 62 mt 03 12 2013 17 03 Lux 311 89 S 03 12 2013 17 03 Source Dist 1 62mt Tmp 5032 K Dia I Neon Tube 72W 4320 Lm minme i 03 12 2013 17 03 Lux 301 06 Source Dist 1 62mt Tmp 5048 K Neon Tube 72W 4320 Lm 301 1 Ix b 03 12 2013 17 03 Lux 255 57 m Source Dist 1 62mt Tmp 5294 K nm 3 Neon Tube 72W 4320 Lm oy Mali 225 8 Ix 150 5 Ix a x Fig 25 Fig 26 13 12 AUTOGAIN CAMERA CALIBRATION Camera AutoGain It may be necessary to recalibrate the camera gain of iDevice to achieve greater accuracy in the measurement of light This adjustment can be made manually by editing the value of the Gain slider via the Gain in the settings panel Gain _ _ lt 8 Offset The value can also be changed by inserting The value via the keypad button enabled depicting the hand The Auto Gain is activated with t
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