You can check the reduced beam angle even by the naked eye when looking at below photo. It shows you the metalhalide light source applied lens. (아래가 렌즈를 적용하였을 때인데 육안으로 보아도 빔각이 확연히 줄어든 것이 확인됩니다.)
You can check the reduced irradiation area by using the iris and the lens barrel in this picture. It can be reduced to half angle 3 degrees at least, it may be more narrow through the aperture.
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