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  Indian J Med Microbiol
 

Figure 1: (A) Cobalt blue light unit (C-BLU) filter adapter consisting of an expandable smartphone holder arm (blue arrow) for housing the smartphone and the blue filter lens (green arrow) attached onto a movable length adjustable arm (red arrow). (B) C-BLU filter mounted on a smartphone using the expandable holder arm with the blue filter lens being aligned with the flashlight of the smartphone such that a cobalt blue light is emitted when the flashlight is turned on and image can be captured using the smartphone camera.

Figure 1: (<b>A</b>) Cobalt blue light unit (C-BLU) filter adapter consisting of an expandable smartphone holder arm (blue arrow) for housing the smartphone and the blue filter lens (green arrow) attached onto a movable length adjustable arm (red arrow). (<b>B</b>) C-BLU filter mounted on a smartphone using the expandable holder arm with the blue filter lens being aligned with the flashlight of the smartphone such that a cobalt blue light is emitted when the flashlight is turned on and image can be captured using the smartphone camera.