Timing Light Treatment for Eastward and Westward Travel.
Chronobiol Int. Jul 2009; 26(5):867-90.
Paul MA, Miller JC, Love RJ, Lieberman H, Blazeski S, Arendt J.
"The light tower (Sunnex Biotechnologies) consists of two towers of two fluorescent light tubes each that emit narrow bandwidth light of 500 nm (green light)"
"Based on the data of Boivin and colleagues (1996), one would expect that a brighter light treatment device would have enhanced phase shifts. However, in our recent work (Paul et al., 2007) comparing much brighter devices against the light tower (350 lux at eye level), two of the brighter devices (each emitting 1,500 lux at eye level) produced less phase shift than the light tower, and the brightest device (emitting 8,000 lux) produced a similar but smaller phase shift than the light tower." Abstract
Circadian Phase Delay Induced by Phototherapeutic Devices.
Aviation, Space, and Environmental Medicine. July 2007; 78(7):645-52
Paul MA, Miller JC,. Gray G, Buick F, Blazeski S, Arendt J.
"Introduction: The Canadian Forces has initiated a multiple study project to optimize circadian phase changes using appropriately timed phototherapy and/or ingestion of melatonin for those personnel on long-range deployments and shift workers. The work reported here compared four phototherapeutic devices for efficacy in effecting circadian phase delays."
"Conclusions: The [Sunnex Biotechnololgies] light tower was the best device, producing melatonin suppression and circadian phase change while relatively free of side effects."
"Light tower (Sunnex Biotechnologies, Winnipeg, Manitoba, Canada; www.sunnexbiotech.com) two towers of two fluorescent light tubes per tower, each tower about 45 cm high with one tower mounted on each end of the base plate. The eye-level light intensity at 60 cm from the eye was about 350 lux. The light tower emits monochromatic light of 500 nm (green light) and is powered by standard electricity (AC)."
See graph below for comparison of melatonin suppression and phase shifts in this study.
OUR NOTES: The standard measures for light intensity in physics or photobiology
is energy (microwatts per sq cm), or photon count.
This paper confirms that light from a Lo-LIGHT tower is more than 10 times as efficient than a device with primary emissions from the blue portion of the visible spectrum, (peak emission at 465 nm)..
One lux of 465 nm blue light has over 4 times the energy (4.37 times) as measured in watts per sq. m than does one lux of 500 nm green light. Therefore 1500 lux of blue enhanced light would provide about 10 times the energy or photon count as 350 lux from a Lo-LIGHT lamp.
1500 lux of 465 nm blue light has the same energy as (4.37x1500=) 6,500 lux of green 500 nm light.
350 lux from a Lo-LIGHT tower was much more effective in melatonin suppression and induced twice as long of a phase shift as did 1500 lux blue-enhanced light (peak 465 nm) even though it provides less than 10% of the light intensity, as measured by energy/photon-count.