# Type of capability

**URL:** <https://community.homey.app/t/type-of-capability/101467>\
**Category:** Developers\
**Created:** [January 17, 2024, 2:32pm UTC](https://community.homey.app/t/type-of-capability/101467 "2024-01-17T14:32:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![GD91](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gd91/32/78099_2.png) [@GD91](https://community.homey.app/u/GD91)\
**Post date:** [January 17, 2024, 2:32pm UTC](https://community.homey.app/t/type-of-capability/101467/1 "2024-01-17T14:32:52Z")

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Hello,  
I’m writing a new driver.  
I’m struggling with an issue about the type of a capability.  
The capability is ‘measure\_luminance’ that is supposed to be a number.  
But the device send a boolean (light/dark) and I got the following error :  
Error: Invalid capability (measure\_luminance) value type. Expected: number. Got: boolean

How to manage this issue?  
Regards

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<div class="post-metadata">

**Author:** ![robertklep](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robertklep/32/160628_2.png) [@robertklep](https://community.homey.app/u/robertklep)\
**Post date:** [January 17, 2024, 3:20pm UTC](https://community.homey.app/t/type-of-capability/101467/2 "2024-01-17T15:20:21Z")

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> [@GD91](#):
>
> How to manage this issue?

Either make up values (0 for dark, 10000 for light, for instance) or create a custom capability.

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<div class="post-metadata">

**Author:** ![GD91](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gd91/32/78099_2.png) [@GD91](https://community.homey.app/u/GD91)\
**Post date:** [January 17, 2024, 4:30pm UTC](https://community.homey.app/t/type-of-capability/101467/3 "2024-01-17T16:30:25Z")

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make up ?

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<div class="post-metadata">

**Author:** ![robertklep](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robertklep/32/160628_2.png) [@robertklep](https://community.homey.app/u/robertklep)\
**Post date:** [January 17, 2024, 4:36pm UTC](https://community.homey.app/t/type-of-capability/101467/4 "2024-01-17T16:36:15Z")

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```auto
await this.setCapabilityValue('measure_luminance', value === 'dark' ? 0 : 10000);

```