Any way to power on a group at one time?

So when I go to MY HOME and look at SmartApps the app is not listed however when I go to Marketplace and look there its still listed.

If you don’t care about them coming on in unison, then just use Smart Lighting, here’s an example -

Four lights:

Home Office Can Light 1
Home Office Can Light 2
Home Office Can Light 3
Home Office Can Light 4

I want all to switch on together so I create a new entry in Smart Lighting -

Which lights do you want to control?:

Home Office Can Light 2
Home Office Can Light 3
Home Office Can Light 4

What do you want to do?:

Turn on & set level

Select trigger:

Switch

Which Switch?:

Home Office Can Light 1

Turn on lights when:

Turned On

Turn off as well:

Yes.

Then all you have to do is turn on ‘Home Office Can Light 1’ and all four will turn on (and off when it’s switched off again).