How to measure light output with a Samsung Galaxy Android phone. Yes, really!

Discussion in 'Lighting' started by dallasg, 24 Jan 2014.

  1. dallasg

    dallasg Moderator MASA Contributor

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    Press *#0*# on a samsung galaxy android Phone, tap the 'sensor' button, then tap the 'light sensor' button and you can start measure your light setup, in LUX.

    A LUX meter will not measure PAR, generally speaking when measuring LUX, the light sensor prefers to pick up more green light, so spectral outputs can either be under or over estimated, depending on the light source.

    PAR is light that's used for photosynthesis; Photosynthetic Available Radiation, PAR meters measure light between 400-700nm.

    You can apply a simple formula to extrapolate PAR values, although I'm unsure how accurate the light meter is on the Galaxy phones, or if it under/over reads certain light sources (such as LED).

    Lux ÷ Constant = µmol·m2·sec

    Lux to PAR Conversion Factors
    Light Source Constant

    Sunlight 54
    Warm White Fluorescent 76
    Cool White Fluorescent 74
    URI (now UV) Actinic Fluorescent 18
    URI (now UV) Daylight Fluorescent 54
    Actinic/Daylight Combination 38
    Philips 03 Actinic Fluorescent 40
    Panasonic 6,700°K Power Compact 72
    Panasonic 7,100°K / 6,700°K Combination 55
    Osram Powerstar Metal Halide 57
    Ushio 10,000°K Metal Halide 54
    Coralife 10,000°K Metal Halide 30
    Venture "Daylight" Metal Halide 46
    Radium "Blue" Metal Halide 51
    Fusion Sulfur Lamp 41
    Westron Mercury Vapor Lamp 70
    Iwasaki 6,500°K Metal Halide 57

    The conversion factors were obtained from a reef keeping forum (reefcentral.com), so I'm confident the maths will be right. What we need to do next, is compare the results of the galaxy to a PAR meter!
     
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  3. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    ....................
     
    Last edited: 24 Jan 2014
  4. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    Last edited by a moderator: 26 Nov 2015
  5. butcherman

    butcherman Moderator MASA Contributor

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    There are many lux apps in the play store too
     
  6. butcherman

    butcherman Moderator MASA Contributor

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    Dallas ypur code works for my S4
     
  7. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    cool
     
  8. mandrin

    mandrin

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    Great stuff its works on my S4 dallasag
     
  9. 4age

    4age

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    @dallasg........I cant find an exponential like button for this thread...freaken awesome!!!!
     
    Last edited by a moderator: 26 Nov 2015
  10. nudibranch

    nudibranch

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    nice
     
  11. MistaOrange

    MistaOrange

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    :( I don't see the light sensor on my S3mini but works on the S3 & S4mini... Grrrrrrr
     
  12. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    glad its helpful
     
  13. Nemos Janitor

    Nemos Janitor

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    Does it work under water? Anyone tried it?
     
    Last edited: 24 Jan 2014
  14. viper357

    viper357 Admin MASA Contributor

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    Well that sucks, no light sensor on my S3 mini :(
    :lol:
     
  15. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    try it and let me know
     
  16. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    can you measure PAR in your algae tank? :p
     
  17. carlosdeandrade

    carlosdeandrade

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  18. JackSplat

    JackSplat

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    Very interesting. I see their are several lux meters on iTunes for the guys with Iphones too. Cool idea, thanks
     
  19. Mac75

    Mac75

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    im getting over 300 lux with phone against the glass at the bottom.... how to get par? :blush:
     
  20. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    read the first post
     
  21. Mac75

    Mac75

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    so in my case i would divide by 38?
     
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