 Using light-emitting diode LED technology, light of narrow bandwidths now can be delivered from a safe, relatively inexpensive device. We propose to contrast in SAD patients the efficacy and tolerability of 468 nm LED light from a portable 11cm x 6cm commercially-available device GoLITEÔ to a broader 400-700 nm wavelength LED-generated light housed in an identical device. The broad wavelength white light from our LED device is similar to that from cool-white fluorescent 10,000 lux devices currently the standard for treatment of SAD see e.g., Lam Levitt, 1999. 