Experimental Light Sources                                Kevin M. Folta

A description of light sources used in:

Green Light Stimulates Early Stem Elongation, Antagonizing Light-Mediated Growth Inhibition
Folta et al., 2004

and

Dhingra, A., Bies D.H., Lehner, K.R. and Folta K.M. (2006) Green Light Adjusts Plastid Transcript Accumulation during De-etiolation. Plant Physiology, in press   (uses the second source)

Green Light Source 1--  (Figure 2)

Source:  Philips "Cool Home Light", a single, 15 W bulb

Filtering: 3 layers of Cinemills M-124 (dark green) cellulose-acetate theatrical gel, Northern Light and Sound, Burbank CA. www.northernsound.net

Emission Spectrum:

Fluence rate (at 10 cm) :  0.1 µmol m^-2 s^-1

Peak Emission:  534 nm, spike at 540.5 nm

Half-bandwidth:  20 nm

Green Light Source 2-- (Figures 3-6)

Source: Ledtronics R-30-123 LED spotlight, Ledtronics Inc., Torrance CA  www.ledtronics.com plus 1/8" clear green plastic

Emission Spectrum:

Fluence rate (at 10 cm) :  30 µmol m^-2 s^-1

Peak Emission:  525 nm

Half-bandwidth:  16 nm

The design, construction and spectra of the custom LED arrays used in Figure 7 are shown here