ppfd meter with smart phone

daveb

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hey found something very interesting, and something you may be interested in. on my iphone I downloaded the App
( Korona-grow light ) and took a piece of bright white 20# paper to cover the front camera so it filters the light as shown in the linked video below went to a buddies place and we tested my light i built with his apogee MQ501 and my phone on sunlight ppfd was within 1 to 5 points of his 500+ dollar light meter

youtube.com/watch?v=t0umUgrS_UE
 

daveb

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made a small mod to the pvc tube he uses in the video and made a notch because my iphone has a case that didn't allow the tube to center over the camera.

i have full spectrum white led light i made 2x4 feet in size with 2:1 ( 3000k red / 5000k blue ) 888 total LED's. running two mean-well 100 watt power supplies total watt draw on killa-watt meter at 209.7 ( that includes the draw the mean-well circuits draw ) . manufacture of LED total draw of LED should be at 177 watts grow area is just slightly larger then light 28x54 inch so results-
center of light
pvc places on camera 337 ppfd
pvc with notch - centered 346 ppfd

at extreme corners
pvc placed on camera 144ppf
pvc with notch - centered 155 ppfd

so .7 to 1.6 uj /w depends where you read. The light is the test light i built shown in the tiny tim tomato photos, not going to complain too much on light output for test light and the grow are isn't finished for reflective sheet across the bottom and front open so light not fully contained and reflected back in as would be in real grow condition
 

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