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 Indian J Med Microbiol  
 

Figure 1: (a) Finger-shaped red light emitting diode device; side view: battery on top, (b) top view: 9V battery power source with a switch adjacent, (c) bottom view: row of nine light emitting diodes on a plastic board, (d) opaque black cover allows light to pass only through bottom

Figure 1: (a) Finger-shaped red light emitting diode device; side view: battery on top, (b) top view: 9V battery power source with a switch adjacent, (c) bottom view: row of nine light emitting diodes on a plastic board, (d) opaque black cover allows light to pass only through bottom