Hook: Ceiling HookThe Temple Ceiling Light decoration fits into a purple ceiling hook.
How to Get a Temple Ceiling Light Decoration
Cartel Pack Decorations
The Temple Ceiling Light decoration can be dropped from Deep Core Explorer’s Packs, which were released on the Cartel Market and bought with Cartel Coins. Cartel Packs, including the Deep Core Explorer’s Pack, include a random selection of items from the Deep Core Explorer’s collection of items. You aren't guaranteed to get a Temple Ceiling Light decoration from a Deep Core Explorer’s Pack, but it is one of the few ways to get a Temple Ceiling Light deco apart from buying it on the GTN from another player.
If you're looking to get a Temple Ceiling Light, the easiest way to get it is to head to the Galactic Trade Network (GTN) in SWTOR and buy it with credits from another player. If it's very rare and not available on the Cartel Market, you could try buying from the GTN and hope you get it.