Shuttered lamp assembly and method of cooling the lamp assembly

An ultraviolet lamp assembly for irradiating a substrate, comprising:

• an elongate ultraviolet lamp bulb having upper and lower portions,
• a power supply circuit coupled to said elongate ultraviolet lamp bulb and adapted to selectively supply either an operating amount of power or a standby amount of power which is less than said operating amount of power,
• first and second side reflector panels mounted on opposite sides of said elongate lamp bulb for pivoting movement toward each other to a closed position and away from each other to an open position,
• a central reflector panel mounted above said elongate lamp bulb and between said first and second side reflector panels, said central reflector panel having perforations,
• a first air gap between said first side reflector panel and said central reflector panel when said first and second side reflector panels are in said open position,
• a second air gap between said second side reflector panel and said central reflector panel when said first and second side reflector panels are in said open position,
• an air moving device configured to direct cooling air downwardly through said perforations at said upper portion of said bulb and downwardly through said first and second air gaps at said lower portion of said bulb, and
• a control coupled to said power supply circuit and operative to cause said power supply circuit to supply the operating amount of power to said lamp bulb when said first and second side reflector panels are in the open position and to cause said power supply circuit to supply the standby amount of power to said lamp bulb when said first and second side reflector panels are in the closed position.