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http://indianaquariumhobbyist.com/community/ :: View topic - lux meter / PAR meter using smartphones
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lux meter / PAR meter using smartphones

 
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codervetri
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PostPosted: Mon Sep 16, 2013 6:22 pm Post subject: lux meter / PAR meter using smartphones Reply with quote

 Very Happy  my  first  post  Cheering  
 
 Ever  tried  an  app  called  lux  Meter?  (  android  users,  its  LUX  METER,  I  dono  for  iOS.  )   Use  it  for  measuring  light  intensity,  how  you  will  use  it,  for  what  purpose  u  r  gonna  use  it  its  all  on  u.
 
 IF  you  have  sony  xperia  z,   Sad  hmm  then,,  you  got  a  PAR  meter   tooo.  (IF  PAR  works  on  the  basis  on  light  intensity)
 
   If  you  don't,  nothing  to  worry,  you  can  still  try  diy  zip  lock  plastic  bag  with  your  mobile  in  it.  U  may  have  to  do  calibrations  if  you  use  plastic  bag,  depends  on  the  bags  transperancy.
 
 Is  the  post  worthy  or  already  people  know  about  this  one?
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saikumar
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PostPosted: Mon Sep 16, 2013 8:02 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 Atleast  I  dint  know.  And  a  drawback  of  not  being  Android  user!
 But  I  was  looking  around  for  the  filters  to  get  a  simple  PAR  meter,  but  none  spare  in  centimetres  size.
 Moreover  you  need  a  standard  PAR  meter  to  caliberate  your  camera,  all  the  more  not  all  cams  are  same  so  wonder  how  a  simple  coded  app  will  be  anywhere  accurate.
 Congrats  on  your  first  post     Thumb Up
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codervetri
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PostPosted: Mon Sep 16, 2013 8:14 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 It  doesn't  need  camera,  it  uses  light  ambient  sensor  in  the  phone  and  gives  you  the  intensity  of  light  in  terms  of  lux  .  This  is  more  sensitive  and  the  reading  0  starts  for  a  low  but  visible  light  (you  can  only  experience  it,  difficult  to  point  it  out  precisely.  But  these  are  sensors  can  get  you  readings  if  you  take  it  closer  to  the  light  source.  I'm  not  sure  about  the  max  intensity  you  can  expose  your  mobile  to.
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superbsite
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PostPosted: Tue Sep 17, 2013 11:24 am Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 @codervetri
 Great  something  new   Thumb Up  
 Why  not  make  a  video  and  demo  it  for  all  of  us  to  benefit  ?
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radjanair
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PostPosted: Wed Sep 18, 2013 8:08 am Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 @codervetry
 Thank  You.   I  have  downloaded  Apps  Lux  Meter  Smoffy  Leung.   and  it  works  fine.
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PostPosted: Wed Sep 18, 2013 8:36 am Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 @superbsite  hey  you  can  YouTube  videos  for  that  app  for  demo.  There's  nothing  much  to  learn  in  that  app.  Its  simple  to  use.  I  don't  know  about  the  calibration  part.I  never  really  used  any  hardware  meters  before.  If  somebody  comes  up  with  a  reference  chart  or  something  like  that  using  that  app,  it  would  be  much  appreciated.
 
 I'm  gonna  use  it  to  experiment  and  find  out  optimum  light  intensity  for  emersed  setups
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Nidhi
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PostPosted: Wed Sep 18, 2013 8:48 am Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 Just  another  reason  to  buy  a  smart  phone..  Chuckle
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radjanair
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PostPosted: Wed Sep 18, 2013 12:35 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 This  may  help.
 Aqua  Design?  >  ?
 Lighting
 Lighting
 Plant  life  has  been  evolving  under  the  sun  for  millions  of  years.  It  follows,therefore,that  natural  sunlight  is  the  perfect  form  of  illumination  for  aquarium  plants.  Natural  daylight,however,is  difficult  to  control  as  its  intensity  varies  from  day  to  day  depending  on  the  season,cloud  cover,time  of  day  and  degree  of  atmospheric  pollution,etc.  And  without  any  control  over  the  amount  of  light  the  aquarium
   
 receives,blooms  of  unwelcome  algae  may  develop  in  excessively  bright  conditions.  It  is  necessary,therefore,to  use  artificial  forms  of  light  in  aquariums.  Fortunately,over  the  past  20  years  or  so,many  new  forms  of  lighting  have  become  available  that  lend  themselves  to  aquarium  use.  By  carefully  controlling  the  quality,intensity  and  duration  of  the  light,it  is  possible  to  achieve  perfect  aquarium  plant  growth  using  purely  artificial  light  sources.
 Quality  of  light
 Visible  light  forms  only  a  narrow  segment  of  total  electromagnetic  radiation,which  ranges  from  extremely  short  cosmic  rays  to  long  radio  waves  and  beyond.  The  familiar  visible  spectrum  of  violet  to  red  light  occupies  a  portion  of  wavelengths  from  380  to  780  nanometers.  (A  nanometer,usually  abbreviated  to  nm,is  a  billionth  part  of  a  metre).  Just  as  the  human  eye  varies  in  its  sensitivity  to  different  wavelengths,so  chlorophyll  in  plants  also  absorbs  the  spectral  components  of  light  to  varying  degrees.  The  absorption  spectrum  for  chlorophyll  shows  noticeable  peaks  in  the  violet-blue  (380-480nm)  and  orange-red(600-680nm)  regions,which  also  mark  -  as  you  would  expect  -  peaks  in  photosynthetic  activity.  (That  plants  reflect  most  of  the  green  light  and  absorb  relatively  little  is  clear  from  their  apparent  green  color  to  our  eyes.)  for  plants  to  prosper  under  artificial  light  it  follows,therefore,that  the  most  effective  light  sources  will  be  those  that  produce  a  large  portion  of  their  light  in  the  blue  and  orange-red  regions  of  the  visible  spectrum.
 Intensity  of  light
 it  is  very  difficult  to  judge  the  brightness  of  a  light  source;it  all  depends  on  the  background  level  of  illumination.  In  pitch  darkness  a  car  headlamp,for  example,may  seem  dazzling,whereas  in  full  daylight  it  appears  very  dim.  To  understand  the  way  brightness  is  calibrated  we  must  introduce  two  units  of  measurement.  The  amount  of  light  produced  by  a  light  source  is  measured  in  units  known  as  lumens.  (The  number  of  lumens  produced  per  watt  of  power  applied  to  a  lamp  is  a  measure  of  its  efficiency.  In  general  terms,  an  incandescent  lamp  is  less  efficient  than  a  fluorescent  tube  because  a  greater  portion  of  the  power  applied  to  the  former  is  converted  into  heat  rather  than  light.)  The  amount  of  light  reaching  a  surface  is  measured  in  lux,which  is  equivalent  to  lumens  per  square  metre.  Lux  is  measured  with  luxmeter  or  lightmeter.  (A  standard  photographic  exposure  meter  can  be  used  to  measure  lux  by  converting  the  diaphragm  and  exposure  times.)
 Plants  vary  widely  in  their  light  intensity  requirements.  Aquatic  plants  growing  in  the  deep  shade  of  a  forest  pool  flourish  at  far  lower  light  levels  than  those  adapted  to  live  in  the  shallows  of  streams  open  to  the  sky.  And  land  plants  that  live  in  the  full  glare  of  the  sun  absorb  surprisingly  high  lux  levels.  The  table  lists  the  lux  requirements  of  a  representative  selection  of  aquarium  plants,plus  some  land  plants  for  comparison.
 Light  requirements  of  selected  aquarium  plants  :
 
         Under  500  lux/Subdued
 Cryptocoryne  affinis
 Cryptocoryne  nevillii
 Cryptocoryne  wendtii
 Vesicularia  dubyana
 
         500-1000  lux/Moderate
 Acorus  sp.
 Anubias  nana
 Aponogeton  madagascariensis
 Echinodorus  sp.
 Lagenandra  sp.
 Nomaphila  stricta
 Sagittaria  sp.
 
         1000-1500  lux/Bright
 Aponogeton  sp.
 Bacopa  caroliniana
 Ceratopteris  thalictroides
 Egeria  densa
 Ludwigia  sp.
 Marsilea  sp.
 Nymphoides  aquatica
 1500+  lux/Very  bright
 Cabomba  sp.
 Heteranthera  zosterifolia
 Hygrophila  polysperma
 Limnobium  laevigatum
 Limnophila  aquatica
 Microsorium  pteropus
 Myriophyllum  sp.
 Nuphar  sagittifolium
 Nymphaea  maculata
 Pistia  stratiotes
 Riccia  fluitans
 Salvinia  auriculata
 Synnema  triflorum
 Vallisneria  sp.
 Land  plants
         Succulents  9,000-14,000  lux
 Young  trees  10,000-15,000  lux
 Cereals  50,000-60,000  lux
 Fortunately,most  aquarium  plants  have  similar  requirements  and/or  are  adaptable  within  a  specific  range.  Thus,it  is  usually  possible  to  grow  different  species  with  varying  lighting  needs  together  in  the  same  aquarium.
 The  duration  of  light
 Tropical  plants  are  known  as  'short  day  plants'.  This  is  because  in  the  areas  of  the  world  close  to  the  equator,day  and  night  are  divided  approximately  into  two  periods  of  twelve  hours  each.  Of  the  twelve  hours  that  the  sun  shines  in  a  tropical  day,sunset  and  sunrise  occupy  a  period  of  one  hour  each.  This  leaves  ten  hours  of  intense  light.  This  period,the  so-called  'photoperiod',is  the  length  of  time  you  should  leave  the  lights  on  in  the  aquarium  for  tropical  plants  to  'feel  at  home'.
 Also  remember,however,that  the  period  of  darkness  is  even  more  critical  than  the  photoperiod.  during  darkness,respiration  is  at  its  highest  level.  Oxygen  is  absorbed  and  carbon  dioxide  released.  The  sugar  stored  in  the  cells  is  oxidized  according  to  the  following  equation:
 C6H12O6  +  6O2  --->  6CO2  +  6H2O  +  674  calorie
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PostPosted: Wed Sep 18, 2013 12:47 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 This  may  help
 
 https://sites.google.com/site/natureaquariumclub/home/lighting
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PostPosted: Thu Sep 19, 2013 11:32 am Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 radjanair  Great  info  sir...  I  was  looking  for  the  same.  :)
 
 
 In  my  desk  I  get  600  Lux..  I  can  keep  crypts  with  ease  now....  Cheering
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PostPosted: Thu Sep 19, 2013 9:10 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 Thank  You  codervetri.   All  the  best.
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PostPosted: Thu Sep 19, 2013 9:37 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 Janardhanji
 
 The   site  is  fantastic  and  has  abundant  information  on  all  aspects  of  aquarium
 
   Clapping     Clapping   Clapping   Clapping   Thumb Up   Thumb Up   Thumb Up  
 
 Regards
 
 Krishna
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PostPosted: Fri Sep 20, 2013 2:23 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

 Thanks  codervetri
 Thanks  JJ
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PostPosted: Fri Sep 20, 2013 4:00 pm Post subject: Re: lux meter / PAR meter using smartphones Reply with quote

                                                   
Nidhi  wrote  (View  Post):                
Just  another  reason  to  buy  a  smart  phone..  Chuckle                

 
 but  cheaper  would  be  
 http://www.ebay.in/itm/3-in1-Moisture-PH-Light-Meter-for-Hydroponic-Plant-Soil-tester-Lux-/330953076155?pt=LH_DefaultDomain_203&hash=item4d0e572dbb
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