SP650 Shortpass Filter (T＞95%@400-640nm, OD5@665-1100nm)

Fluorescence Microscopy (Excitation Filter)

In biology and medicine, scientists use glowing dyes to highlight specific parts of a tiny cell under a microscope. To make the dye glow, they need to blast it with high-energy visible light (like blue or green). However, they absolutely must prevent any low-energy red or infrared light from the lamp from mixing into the microscope, as it would wash out the faint glow of the cell. This filter easily slices out just the visible part needed to "excite" the dyes.

Recommended light source:

• Broadband Arc Lamps (Mercury or Xenon): These lamps are incredibly bright and output a massive spectrum of all light colors. The advantage here is that the filter easily tames these powerful lamps, blocking the useless infrared wavelengths while capturing the intense visible light needed for the experiment.
• High-Power visible LEDs (Blue/Green): These run much cooler than arc lamps and target specific visible colors. The advantage of pairing them with this filter is to guarantee that absolutely no accidental "tail" of red light sneaks out to ruin the delicate image.

Machine Vision and Automated Factory Inspection

Factory robots rely on cameras to inspect products on an assembly line. If a factory has large windows, fluctuating sunlight throughout the day introduces shifting amounts of infrared light, which can confuse the robot's camera and cause it to make mistakes. This filter acts as a shield, ensuring the robot's "eye" only sees the controlled, artificial visible light inside the factory, completely ignoring the changing infrared light from the sun.

Recommended light source:

• Visible LED Ring Lights: These are typically mounted right on the robot's camera. The advantage is that they provide highly controlled, shadow-free visible illumination directly on the product, which easily passes through the filter.
• Standard Fluorescent industrial lighting: This is the cheap, common lighting used to illuminate massive factory floors. The advantage is that it provides a broad baseline of visible light, and the filter ensures only this stable visible portion reaches the robot's sensor.