How long does it generally take for the light bulbs on the TF-2 to warm up?

The typical warming time for the light bulbs on the TF-2 is generally between 2 to 4 minutes. This time frame is important because it allows the bulbs to reach optimal operating temperature, ensuring that they perform effectively when needed. The warming process is crucial for achieving the necessary brightness and color temperature for accurate readings or operations involving the device. Understanding this warming duration helps users plan accordingly for tasks that depend on the proper functioning of the TF-2's lighting system. The other options either underestimate or overestimate this essential warming period, which could lead to less efficient use of the equipment.