I really don't remember, I'll have to look it up but I think the philips numbers were coming from their own paperwork and recommendation of running the lights 18 inches (45cm) from the growing surface. Check out these two videos they show how they were designed to be run.@PicklesRus I was going to go with the LUXEON XF-3535L LED Strips because they have a 3M tape on back and are easy to work with. No need or drilling holes.
I went with samsung strip in my latest project because i wanted to be able to swap out the strip with 5000K or 3000K or a different CRI and see how it impacts the color of leaves and growth.
The purple color could be due to stress or phosphorus deficiency.
The PPF will decreases at distance increases. For my lamp i used a box to have a reference point of PPF measurement. Since i wanted to measure how much more light i am getting at the same reference point after i upgrade the led strip.
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I will have to read this and see - there are so many variables with LED it really makes my head spin.Here is some data with Samsung 560mm long strip SI-B8T341560WW at about 37 watts
I didn't measure, I took it form the chart, and the ones I have are marked that they are 35w.Not sure about Philips output only 50ppfd @ 35w. How did you measure the 50ppfd @ 35w.
Which one are you using. From a commercial lighting distributor, those are typically who sells them as they regularly order large volumes of philips product.
If the price is not to high these philips once should be good.
Yes they are 140$cdn per bar. I found a greenhouse selling 80 of them for 100$ Each, used less than a year.I looked at green power bars a year or two ago and they were really pricey. I'm guessing that price per par watt is high and you could probably build something cheaper with good enough efficiency with the smaller LES cobs (vero10s, vero18s, cree2530 etc.) .
I guess they (the greenhouse) don't likemYes they are 140$cdn per bar. I found a greenhouse selling 80 of them for 100$ Each, used less than a year.
Here's my lettuce at 11" mounting height . Just yesterday I raised them to 16" as I thought they weren't growing as tall as they could. I guess I'll find out (and sorry for hijacking your thread @robincnn)The Green Power Modules are pretty much a joke in my experience.
I know "The Lettuce People" was using them but when I inquired she told me her plants were being started under T5 and then moved to the LED. If they are so great why can they not get the plant up and rolling from seed without major stretching?
I purchased one to experiment before, installed at the "Shelf Height" as per the manual and here is what lettuce does under them (this was Deep Red/Blue)
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Not to mention the headache you get from the shade of light coming out of that thing
I tried a red blue lamp as under cabinet grow light in kitchen as its light was an eye sore. Never liked the plants under it either.The Green Power Modules are pretty much a joke in my experience.
I know "The Lettuce People" was using them but when I inquired she told me her plants were being started under T5 and then moved to the LED. If they are so great why can they not get the plant up and rolling from seed without major stretching?
I purchased one to experiment before, installed at the "Shelf Height" as per the manual and here is what lettuce does under them (this was Deep Red/Blue)
View attachment 3578227
Not to mention the headache you get from the shade of light coming out of that thing
Is this Constant Current?
Both are 18V so works great. With constant voltage drivers Voltage needs to match not the current.Is this Constant Current?
LED strip is 18V 600mA right? This power supply is 18 V, 1.38 A
so how does that work? It doesn't match the LED perfectly does it?
Ah ok. I'm thinking of building a 4' strip to see how well it works.Both are 18V so works great. With constant voltage drivers Voltage needs to match not the current.
I have used LPV-35-36 36V driver with the longer 36V version of LUXEON XF-3535L
LUXEON XF-3535L are 18V,21V,36V common numbers except 21 and easy to find a constant voltage driver. With Samsung strips the voltage on high power once is not a round number and constant current driver might be choice.
Any strip / driver part number ideas for making 4ft strips?Ah ok. I'm thinking of building a 4' strip to see how well it works.
why is that heatsink in a glass of water?My veg attempt with 10 watt LUXEON XF-3535L strip 300mm long.
4 plants under 10 watts. See how close to light they are.
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