Adding Wiz WIZ294819 downlight

[mike-debney]

Device information

The Wiz WIZ294819 Presco 3.5 inch recessed downlight 8W is sold in New Zealand and fits a standard 90mm cutout. It reports to Home Assistant as SHRGB, however this model is already used by completely different lights, so I used the model number WIZ294819 instead.
https://www.wizconnected.com/en-nz/p/downlight-35-inch-recessed-downlight-8w/8720169072251
https://www.noelleeming.co.nz/p/wiz-full-colour-preso-downlight-8w-3.5-inch/N224211.html
https://www.jbhifi.co.nz/products/wiz-preso-smart-downlight

Home Assistant Device information

SHRGB
by WiZ
Firmware: 1.35.0
Hardware: ESP24 01
MAC: 44:4F:8E:F1:CD:2C

Checklist

• I have created a single PR per device. When you have multiple submissions please create separate PR's.
• For lights - I have only included the gzipped files (*.gz), not the raw CSV files.
• For lights - I have provided a CSV file per supported color mode. Look that up in Developer Tools -> States

Additional info

Measured color_temp and hs with 4x bulbs via the measurement script and a Shelly 2.5.

[github-actions]

Thank you for submitting light measurements!
Here are some visualizations for the CSV files.

[bramstroker]

Thank you. Congrats on your first contribution. Measurements look nice!

Few remarks.

You'll need to add SHRGB as alias to model.json. Then powercalc will also autodiscover, and provide the user the choice between 2 profiles.

I see standby_power is 0. That's not possible, and it's 0 because it's below the threshold which Shelly 2.5 can measure.
Could you try again to see if you can get some measurements without using the measure script?
It's probably in the ballpark of 0.2-0.3W

[mike-debney]

No problem - alias added. That makes sense!

Agreed about the standby power, however I don't have the means to measure the standby power without using the shelly. Reading the shelly directly reports 0W, must be below what it can measure - even with four lights on the circuit.

[bramstroker]

I’m not entirely sure how to proceed, looking at the existing WiZ profiles in the library, standby power isn’t a common value we can reliably estimate.

I’m a bit surprised that even with four lights connected, the Shelly 2.5 couldn’t pick up any reading, though it is an older-generation device. Most of the existing profiles were created using a Shelly PM Mini Gen3 or a Shelly 1PM Mini Gen3, both cost under $15.

These newer models should be able to measure the standby power of the WiZ bulbs. You might consider getting one for measurement now and later repurposing it in your smart home setup.

[mike-debney]

My guess is that it must be around 0.2W - I've seen the shelly measure ~1W during the test, so it must be under 1/4W.

I tried turning three of the lights on full brightness at 153 mireds. From our readings, we expect this to be 7.81W. The fourth was off. The Shelly reported 23.96W, so the difference must be the standby of the fourth light:
23.96 - (7.81 * 3) = 0.53W

However this number is much higher than we'd expect. I suspect there is large enough error in the readings that an estimate of 0.2W is probably within reasonable limits.