Kind regards
James
Asked by: james walshaw
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Description
White 5mm Standard Diffused LED with a viewing angle of 60 degrees. Luminous intensity 700mCd.
| Forward voltage drop: | 3.1 V |
| Viewing angle: | 60 degrees |
| Max forward current: | 25 mA |
| Luminous intensity: | 700 mCd (@20mA) |
| Lens types: | Diffused |
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Q:
Hi If I have 4 of these powered by a 9v battery how many hours of illumination could I expect to get?
Kind regards
James
Kind regards
James
A:
Hi James, It would depend on the capacity of the battery. If you are using a standard 9V then these have a range of capacity from around 400-1000mAh. This LED draws around 20mA, so 4 would draw around 80mA, if your battery had the lowest end capacity of 400mAh then you would get around 5 hours of constant illumination.
Answered by: Michael Lockhart
25-Jan-18
Q:
Would it be okay to use this led with a Micro:bit? If so would a 'protective' series resistor (47 ohm?) be needed? Thank you.
Asked by: Paul
A:
Hi Paul, As the LEDs forward voltage and the micro:bit supply voltage are the same there wouldn't be a need for a resistor as you don't need to drop any voltage.
Answered by: Michael Lockhart
15-Sep-17
Q:
What power will I need to make one of these light up? 2x 1.5V batteries?
Asked by: Dr T
A:
The forward voltage on this LED is 3.1V so you need at least 3.1V from your battery. 2 AA batteries will give you 3V when they are new, however over time the voltage will drop down to 1V per cell or 2V across both of the batteries. You can probably get away with a 3V power source on an LED with a 3.1V forward voltage, but it certainly won't work down at 2V. You might be better going for 3x AA batteries with a 68 ohm or 100 ohm series current limit resistor.
Answered by: Geoff Hampson
15-May-12
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