Mega-Ray Metal Halide have been rigorously tested in the field for almost 2 years. Serum vitamin D3 testing has been completed and continued testing is being done at one of the leading zoos in the USA.
These bulbs have proven to be useful in D3 production for 12-18 months with little loss in brightness (LUX) or in UVB-A. These bulbs are extremely bright, and much more like the natural sun after 8 or 9 AM, and should not be considered for use for the complete 12 hr photo period. They should only be used in the over head position. 8 hours a day is more then sufficient for the Mega-Ray Halide.
Lamps in basking areas should be on multiple timers to allow a more natural lighting effect. As an example; Halogen on in basking area at 7am, Halide and additional heat (halogen or heat projector) on at 8:30am. 5000K tube daylight fluorescents at 10am, and off in the opposite order during the afternoon.
This will reduce stress and prolong the life of any captive creature.