Green Leaf Organics Posted June 15, 2015 Share Posted June 15, 2015 Hi guys Since most of us have smartphones these days I thought it would be fun to see at what lux you guys are running at canopy level. If you don't have an app you can get a light meter app at the play store or apple store. Quote Link to comment Share on other sites More sharing options...
420SA Posted June 15, 2015 Share Posted June 15, 2015 I'm getting around 120 000 lux at canopy with a 600w. Is that about right? Using the Beecam ligtmeter on Android Quote Link to comment Share on other sites More sharing options...
Green Leaf Organics Posted June 15, 2015 Author Share Posted June 15, 2015 That's about perfect for a 600w , digital I presume. I try stay between 100k and 120k Quote Link to comment Share on other sites More sharing options...
Guest Maxwell Posted June 15, 2015 Share Posted June 15, 2015 Not to "throw a spanner in the works"( ), but anyone able to measure PAR? Is an app available? By the looks of CMH they would peak higher in PAR than a higher wattage HPS?! Similarly a PAR value of LED vs HPS would be interesting... Thoughts? Quote Link to comment Share on other sites More sharing options...
Green Leaf Organics Posted June 17, 2015 Author Share Posted June 17, 2015 The thing about par is that it's not a widely adopted reading for any bulbs. Some specialised bulbs will state there par rating but unless you import the bulbs directly you won't find them in SA. While we all know lux is light intensity for human vision while plants use par. Now for a home indoor grower measuring par us not easy unless you prepared to fork out big cash. Honestly the home grower also has no need for a par meter , par and lux are very closely linked and if you can measure lux you can get a rough par reading. The reason why I say a par meter is a waste is because like it or not once you have bought all your equipment you are stuck with you par rating and can only increase it by moving lights up and down. Now bring in the phone app light meter , yes it's an app and yes it's probably not very accurate but.... what it does do is give you a reference point . It measures in lux , light intencity , and light intensity is light intensity weather measuring in lux or par. This is way 90% of the grow community will use a lux and have things rated in lumen , it's just easier . Here are the multipliers to convert illuminance in Lux to PPFD for some common light sources: Source Multiplier Sunlight 0.0185 Fluorescent (Grolux) 0.029 Metal Halide 0.0141 Fluorescent (865/840) 0.0135 High Pressure Sodium 0.0122 Figures provided by Apogee Instruments. So, we can multiply the Lux value by the multiplier in the above table to find the PPFD in µmol m-2 s-1. Worked example: Code: 60 cm x 60 cm space (0.36 m²) 250 Watt HPS lamp (33,200 lumens) Lux = (total lumens) / (total area in square metres) = 33,200 / 0.36 = 92,222 PPFD = Lux x factor = 92,222 x 0.0122 = 1,125 Quote Link to comment Share on other sites More sharing options...
Green Leaf Organics Posted June 19, 2015 Author Share Posted June 19, 2015 It's always good to adjust! Much better now Quote Link to comment Share on other sites More sharing options...
420SA Posted June 19, 2015 Share Posted June 19, 2015 Wow what lighting is generating that?? Quote Link to comment Share on other sites More sharing options...
Green Leaf Organics Posted June 19, 2015 Author Share Posted June 19, 2015 To be fair only the plant right under the light gets that , plantastar 1000w digital in a aircooled hood Quote Link to comment Share on other sites More sharing options...
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