Disclosed herein is a wavelength converted light emitting apparatus comprising a substrate, a light emitting diode, and a phosphor layer. The guiding member is movably supported on the contact moving member. The light received by the protruding part directly enters or is reflected to enter the light guide, and then the light leaves the light guide to provide backlight. In other embodiments, the method senses upstream and downstream temperatures, determines air velocity in the duct, determines the amount kilowatts or other heat per unit time or power based thereon, and enables the power control switch when the resultant is less than a predetermined value.