Red 5mm Water Clear LED - 30deg - 1000mCd, pack of 50

Stock code: 3507

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No of parallel LEDs:
LED forward voltage: V
Typical LED current: mA
Battery voltage: V
Resistance (calc): Ohms
Preferred value: Ohms
Resistor colour bands:
Enter the operating voltage, click calculate resistor and the resistor value to work with the LED described on this page will be shown.
Forward voltage drop 1.85V.
Viewing angle 30 degrees.
Max forward current 30 mA.
Luminous intensity 1000 mCd (@20mA).
Lens types Water clear.

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Further Information

I am thinking of buying some 5mm led bulbs to use in a science project with children in my class. They will need to make a circuit to light up the bulb. Another teacher said she did thus using a cell battery - a cr2032 I think. Will this be the right battery to use with these bulbs and would they work also with the colour changing bulbs? Thank you, Abi
Asked by: Abi
The ultra-bright red LED has a forward voltage drop of about 1.9V so in theory with a 3V CR2032 cell you would want to use a current limit resistor something like a 68 ohm or a 100 ohm. However the coin cell can only deliver a limited amount of current so in reality you are often able to get away without using a current limit resistor. The colour changing LED is rated between 2.7V and 5V so would work fine off a coin cell battery, though it won't be at full brightness again because the coin cell won't deliver enough current to run at full brightness, but it will still work fine.
Answered by: Geoff Hampso

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