Modified polyvinyllactams and their use. Conventional sprinklers are too sensitive to the outbreak of a fire, and operate even if no fire has broken out, which would lead to a large amount of damage. Whereby, the driving apparatus could drive LED chips of different specifications. The power source circuits 1 to 3 constitute a first voltage channel by a power source line DH1 and a parallel operation control line PCH1 of the electronic circuit 8, whereas the power source circuits 4 to 6 constitute a second voltage channel by a power source line DH2 and a parallel operation control line PCH2.