Quote:
Originally Posted by samfish
Thanks for the replies, Terry and Naoki!
I currently have one ALT PAR38 30-Watt 100 Degree Light from Jerry at orchidweb.com, and several of the 13-Watt LED Lamps from Ray at firstrays.com
orchidweb.com says the 30-Watt 100 Degree light gives Medium-High intensity at 3-4 feet, and Ray says his lamps grow phalaenopsis well at 12-15" distance... I am trying to quantify intensity, so I can optimize a variety of plants in a relatively small growing area...
I couldnt find much detailed info on spectrum of either light, but will take a look at the site you mention!
Thanks for the info!
-sam
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If it is mostly white, you can just go with the fc/lux, right?
If you want to know the PPFD, here is a conversion factor of white LED:
0.1514886 micromol/m^2/s per 1 foot-candle.
I calculated this from Cree 4000K 80CRI. There are some variation due to color temp and CRI, but 0.15 is probably good enough. So if your meter says 1000fc, you are getting about 151 micromol/m^2/s. The conversion factor is similar to fluorescent light (see
this). Aeon Lighting (ALT) could be using Cree, Bridgelux, Oslam, or Philips, but I didn't see the specification in orchidweb site.
By the way, it has only 82.7 lm/W, which isn't efficient with the current standard. I'm not saying that it is not useful, it will grow plants and some people may not care about efficiency. But you can get LED shop light or T8LED at the fraction of the cost from Walmart or CostCo, which has 98-105lm/W or more. So if you need more (or if you need to replace it in the future), you might want to explore other options.
Ray's have a bit of additional red, so the conversion factor could be slightly different. If I get a chance, I can measure the PPFD and fc. Ray's site says that 11W model gives 45 micromol/m^2/s and 13W modles gives 55 micromol/m^2/s at 12" distance. So if you measure the fc/lux at 12", you can calculate your own conversion factor.
Thank you for the info, Terry. Maybe I can use less light, too.
Hybrid Mode
