The light shield protects the torch from discoloration caused by the plasma.
The Torch Light Shield Disk is included in the PFA-Platinum HF-Resistant Sample Introduction Kit (N8150033), the Organics Sample Introduction Kit (N8150031), the NexION 2000 Base Configuration's Sample Introduction Kit (N8150034), the Core Configuration's Sample Introduction Kit (N8150035), the Productivity Configuration's Sample Introduction Kit (N8150036), and the Semi Configuration's Sample Introduction Kit (N8150037).