# what is the wattage of red fairy lights - product PRT-14503

**URL:** <https://community.sparkfun.com/t/what-is-the-wattage-of-red-fairy-lights-product-prt-14503/42050>\
**Category:** LEDs\
**Created:** [April 28, 2021, 10:28pm UTC](https://community.sparkfun.com/t/what-is-the-wattage-of-red-fairy-lights-product-prt-14503/42050 "2021-04-28T22:28:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kano](https://avatars.discourse-cdn.com/v4/letter/k/3d9bf3/32.png) [@kano](https://community.sparkfun.com/u/kano)\
**Post date:** [April 28, 2021, 10:28pm UTC](https://community.sparkfun.com/t/what-is-the-wattage-of-red-fairy-lights-product-prt-14503/42050/1 "2021-04-28T22:28:21Z")

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I would like to ensure my battery and circuit design are properly sized to drive the whole string of red LEDs, PRT-14503.

[https://www.sparkfun.com/products/14503](https://www.sparkfun.com/products/14503)

They are listed as running at 3 V. If you know their current draw or wattage, I’d appreciate learning that so I can finish my design and order everything I need in one go.

Thanks!

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**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\
**Post date:** [April 28, 2021, 10:40pm UTC](https://community.sparkfun.com/t/what-is-the-wattage-of-red-fairy-lights-product-prt-14503/42050/2 "2021-04-28T22:40:00Z")

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The manufacturer doesn’t provide that, but one could safely assume that because it uses two CR2032 [https://www.amazon.com/AmazonBasics-CR2 … B0787K2XWZ](https://www.amazon.com/AmazonBasics-CR2032-Lithium-Coin-Cell/dp/B0787K2XWZ) which show 225mAh, so they appear to run @ ~450mAh, though it is still a better practice to determine this experimentally, and adjust.

Hope this helps!