As I have explained earlier you may use a simple 1N4005 diode instead the LEDs.
Let’s compare LEDs vs. diodes
a) Reverse voltage is the maximum "wrong way" voltage that can tolerate. Anything over that and you start getting "wrong way" current.
LEDs > U reverse = 5V - 7V
Diode (1N4005, general purpose diode) >> U reverse = 600V
1N4005 better protection than simple LEDs
b) I forward = the maximum amount of current flowing through the element.
LEDs > I forward = 20-50 mA
Diode (1N4005, general purpose diode) > I forward = 1000 mA
1N4005 higher current than simple LEDs
c) U forward = the maximum voltage you want to sustain across it
LEDs > U forward = 1.7V(standard RED) up to 4V(blue LED)
Diode (1N4005, general purpose diode) > U forward = 0.7V up to 1V (@ 1 A)
1N4005 lower voltage drop than simple LEDs
Also if we compare prices:
1N4005 at 0.001$/piece (for 1000pcs)
LEDs at 0.01-0.05$/piece (for 1000pcs)
1N4005 winner…