hotwired's Experimental Lighting garden
Garden Type: Propagator | Sun: None | Soil: None | Established: 2010
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25 Feb 2012
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Evaluating CFL Bulbs - Spectral Curves
Experimental Lighting gardenCloudy 2°C / 36°F
I finally got over to my old shop early this morning and ran some curves on the spectrophotometer. I ran curves on Natural Daylight bulbs and on Soft White bulbs. I was pretty surprised by the results. I tested 23W bulbs. I scanned the graphs and overlaid each over the PAR curve (Plant Activ...
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21 Apr 2010
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Spectral Curves for 90W LED Growlight UFO
Experimental Lighting garden19°C / 66°FI borrowed my friend’s “Advanced 90W LED Grow Light”, and finally got a chance to run down to my old Company and run some curves with the Spectrophotometer. I also got the cover off and checked the LED specifications. The device contained (90) 1-watt Power LED’s in three...
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16 Apr 2010
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What a difference @ 24hr/day LED Lighting
Experimental Lighting gardenRainy 16°C / 61°FIn Mid February, my friend bought a small LED growlight, which is 8"diameter with a bunch of multicolor LED lights in it. He asked me what I thought of it, and I didn’t think much of it. It looked like a toy to me, just big enough for one or two plants at the most. He wanted to try ...
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12 Apr 2010
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Comparing Commercial Grow Light Spectrums
Experimental Lighting gardenOvercast 5°C / 41°FI overlayed 4 Spectral Graphs of common Grow light Type on the market onto the graph of the wavelengths that plants use. I compared a Blacklight, Halophosphate bulb, Halide Bulb, and High-pressure sodium bulb. The blacklight at 370-390nm is good in the low spectrum but has no light in the 680-75...
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10 Apr 2010
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Plant Light Requirements vs Sunshine vs Halide
Experimental Lighting gardenCloudy 2°C / 36°FFortunately I live close to Cornell’s AG School, and I have some really good contacts there. I’ve drawn some conclusions based on a lot of conflicting data. Everyone has different numbers on what plants require and use of various wavelengths of light, but one thing remains relatively constant and...
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10 Apr 2010Experimental Lighting garden
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9°C / 48°FI did an optical ray trace for a Commercial Halide Grow Lamp. I summarized the findings in a sketch ( Figure 3 ). The drawing assumes that a 12″ × 24″ Tray is placed directly below the lamp at a distance of 12". The specs claim a parabolic Reflector. The bulb is 150 Watt...
