# Energy consumption of raspberry pi connected led

**URL:** <https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139>\
**Category:** General\
**Created:** [4 August 2020 17:04 UTC](https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139 "2020-08-04T17:04:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![usmanEmder](https://avatars.discourse-cdn.com/v4/letter/u/977dab/32.png) [@usmanEmder](https://discourse.nodered.org/u/usmanEmder)\
**Post date:** [4 August 2020 17:04 UTC](https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139/1 "2020-08-04T17:04:08Z")

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Hi everyone.  
I want to calculate the energy consumption of led which is connected with raspberry. Can anyone suggest to me, how can it be done?

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 August 2020 17:50 UTC](https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139/2 "2020-08-04T17:50:15Z")

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Multiply the power of the led in Watts by the time it is on in hours and divide by 1000 to give kW hours.

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**Author:** ![usmanEmder](https://avatars.discourse-cdn.com/v4/letter/u/977dab/32.png) [@usmanEmder](https://discourse.nodered.org/u/usmanEmder)\
**Post date:** [4 August 2020 18:15 UTC](https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139/3 "2020-08-04T18:15:09Z")

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Thanks for your kind reply, But how can I measure the time?

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 August 2020 19:49 UTC](https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139/4 "2020-08-04T19:49:58Z")

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A quick search of the node red flows site found this which might be helpful

> **[node-red-contrib-hourglass](https://flows.nodered.org/node/node-red-contrib-hourglass)**
>
> Node-red node calculating elapsed time

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [3 October 2020 19:50 UTC](https://discourse.nodered.org/t/energy-consumption-of-raspberry-pi-connected-led/31139/5 "2020-10-03T19:50:16Z")

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