DEAR SIR, I AM USING ABOVE MODEL NO. PROJECTOR. SINCE ITS LAMP LIFE IS NEAR TO END, SO I REPLACED LAMP WITH ORIGINAL ONE,AND RESETED THE LAMP COUNTER ALSO. AFTER SWITCHING ON PROJECTOR WITH NEW LAMP, IT WORKS FOR 5 HRS. AND AFTER THAT, LAMP IS GOING OFF AND PROJECTOR IS GOING IN COOLING MODE. AFTER COMPLETION OF THIS COOLING MODE(I.E. AFTER 1 MINUTE)PROJECTOR AGAIN COMING IN STAND BY MODE AND GETTING READY FOR THE SWITCH ON LAMP.