Yep, realized just after posting, ended up with the following, which seems to be working well so far.
alias: Large Tank Light by Elevation
description: Increase / Decrease Brightness by Elevation
trigger:
- platform: state
entity_id: sun.sun
attribute: elevation
condition:
- condition: time
after: '07:00:00'
before: '19:00:00'
- condition: numeric_state
entity_id: sun.sun
above: '0'
attribute: elevation
action:
- service: light.turn_on
data_template:
brightness_pct: '{{ (state_attr(''sun.sun'', ''elevation'')| multiply(2)) | round(0) }}'
target:
entity_id: light.white_led
mode: single