At the exhibition (1)

Exhibitions are a great opportunity for us to hear from the market.

OF THE THREE MODELS, TWO COAXIAL DOME LED LIGHTING UNITS AND ONE HIGH-FREQUENCY LIGHTING FLUORESCENT LAMP (MANUFACTURED IN-HOUSE) WERE USED IN THE DEMONSTRATION UNITS AT THE EXHIBITION. THE COAXIAL DOMES WERE USED "TO STABILIZE IMAGES OF GOOD PRODUCTS," AND THE HIGH-FREQUENCY LIGHTING FLUORESCENT LAMPS WERE USED "BECAUSE WE NEEDED INEXPENSIVE, LARGE, BRIGHT SURFACE ILLUMINATION.

One of the most common voices heard was "I can't see well with LED lighting". It may be the right material for the right job, but I think there are many negative factors: single wavelength (with color), directional, and dark. At the very least, the image will be different from the full-wavelength (white), weakly directional, bright fluorescent lights used in visual inspections.
It is true that LED lighting is gaining momentum to displace fluorescent lighting, but the true needs may lie in a different area.

Incidentally, I think the bottleneck with fluorescent lamps is the change over time. However, according to the FI case study, lot-to-lot variation of the object is shorter in cycle and larger in amplitude than the variation over time of the lighting, so if you really want to improve the detection capability, it seems that you need to reconfigure the settings for each lot. If you are re-setting for each lot, I don't think you need to be too aware of changes in illumination over time.
Some FI users are re-registering good products for each lot (by simply running 100 or so products through the system in the same way as during the inspection) and inspecting "that the lot is complete". This way, highly sensitive sorting is possible, eliminating lot-to-lot variation and the effects of lighting changes over time.