Barrazaburnz
Active Member
yieldmasterleds .com lights work well and they even do custom spectrum lights!
There's tons of resellers popping up every few days with the same Chinese lights with a huge markup, I do not understand why they can't come up with something original if they want to sell to people, or at least have some verifiable datasheets on the LEDs and PAR values listed.... At least change to a known LED diode or something... Heliopto's for the lower cost win!yieldmasterleds .com lights work well and they even do custom spectrum lights!
Cree XM-L www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXML.pdf
Unless that's old news and you're staying with just cutting edge. For my next panels, what I don't know is if it may be better to use last generation LEDs for the savings, vs. new generation for output / efficiency. Too complicated to add prices to your spreadsheet, I was just making the case for listing 1 gen old LEDs that are popular so I could compare new to almost new tech
Good Lord........... I forgot how much Far red comes off a halogen bulbRegarding the far red LEdengin, it is about 17% efficient (700mA 50c). I have found no need for far red but for those who find it useful, it may make more sense to use incandescent or halogen with a reflector since the bulbs are so much cheaper than LED and halogen may actually be more efficient in that range than LED.
View attachment 2762216
Again, have a look at the Led Engin Spectrum toolAnyone got any experience in calculating PAR output?
Easiest is to use LedEngin tool like yabo said, obtain a ppf/x lumen multiplier per spectrum and use that. Right and more useable in the future would be the knna way, that way you have the ppf/nm data and you can build more datasets out of it like "YPF" in his sheets (better for comparing true efficacy of different spectrum). Biggest downfall in his method is tedious hand digitizing, if you can get around that by some program or method, things would be fun & easy.Anyone got any experience in calculating PAR output?
If I find a way to easily gather data from the spectra from the datasheets, then I will be able to make a tool that will be able to calculate everything we could imagine.
The biggest hurdle right now, is extracting data easily from the datasheets.
The problem I'm having, is that most datasheets list the performance in lumen and not mW. Lumen is a measure of how bright the human eye sees the light.a nice Calculator from Russia
View attachment 2763980
http://ledcalc.fonarevka.ru/
Again, have a look at the Led Engin Spectrum tool
here is my Version, tailored for the new Project
View attachment 2763986
it does everything you want...
and for Calculating Flux, par etc...
start here
http://www.pveducation.org/pvcdrom/properties-of-sunlight/energy-of-photon
Yabo
I think those tools are a bit too confusing, so I'd like to make my own that's much easier to use.Easiest is to use LedEngin tool like yabo said, obtain a ppf/x lumen multiplier per spectrum and use that. Right and more useable in the future would be the knna way, that way you have the ppf/nm data and you can build more datasets out of it like "YPF" in his sheets (better for comparing true efficacy of different spectrum). Biggest downfall in his method is tedious hand digitizing, if you can get around that by some program or method, things would be fun & easy.
Just wondering how much the spectral distribution chart resembles true output of white leds, taking into consideration the available tints and chromacity bins. A thing to consider when comparing outputs, too much trust in the data might lead you wrong. Not so much of a problem in coloured leds, but they have spectral shift etc too. Spectroradiometer would be a nice toy
http://buymarijuanaseeds.com/community/threads/bulb-analyzer-tool-actualized.117933/
Awesome! Bookmarked!The idea is very simple, just go through the instructions and try. Not very intuitive to use, but I don't know any other way. Looking for an option for digitizing: http://digitizer.sourceforge.net/usermanual/tutormanlinegraph.html
Better suggestions?