[w3ctag/design-reviews] WebXR Lighting Estimation (#574)

HIQaH! QaH! TAG!

I'm requesting a TAG review of the [WebXR Lighting Estimation API](https://immersive-web.github.io/lighting-estimation/)

"Lighting Estimation" is implemented by AR platforms using a combination of sensors, cameras, algorithms, and machine learning. Lighting estimation provides input to rendering algorithms and shaders to ensure that the shading, shadows, and reflections of objects appear natural when presented in a diverse range of settings.

  - Explainer: https://github.com/immersive-web/lighting-estimation/blob/main/lighting-estimation-explainer.md

  - Specification URL: https://immersive-web.github.io/lighting-estimation/

  - Tests: (will be a folder under https://github.com/web-platform-tests/wpt/tree/master/webxr)
  - Security and Privacy self-review: https://github.com/immersive-web/lighting-estimation/blob/main/security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/immersive-web/lighting-estimation/issues

  - Primary contacts (and their relationship to the specification):
      - Brandon Jones, @toji, Google, Editor
      - Kearwood Gilbert @kearwood, (Former Mozilla), (Former?) Editor
      - Alex Cooper, @alcooper91, Google, Immersive Web WG Member
  - Organization(s)/project(s) driving the specification: Immersive Web CG
  - Key pieces of existing multi-stakeholder review or discussion of this specification: https://github.com/immersive-web/lighting-estimation/issues/

  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/features/5704707957850112,

General Mozilla support for WebXr specs (though Lighting not specifically called out): https://mozilla.github.io/standards-positions/#webxr


Further details:

  - [X] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: 
  - The group where the work on this specification is currently being done: [W3C Immersive Web CG](https://www.w3.org/community/immersive-web/)
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): [W3C Immersive Web](https://github.com/immersive-web)
  - Major unresolved issues with or opposition to this specification: N/a
  - This work is being funded by: N/a

You should also know that...

N/a

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  🐛 open issues in our GitHub repo for **each point of feedback**



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