Studio Beam
llll light
Pretty stretched fabric lighting. Some revit files on archiproducts: https://www.archiproducts.com/en/llll/products/bimtype_revit
Stillux
Pilke lights
Birch lights
Aldabra
Linear, recessed, and spotlights. Some nice flexible ones.
Puff Buff
Blow up lighting - lots of fun.
TWENTYBRANDESIGN
Euroluce Light of Italy
They have a few Revit files on Archiproducts and you can request via form (though I haven't heard back).
ILFARI
Only a few Revit files on Archiproducts: https://www.archiproducts.com/en/ilfari/products/bimtype_revit
D'Armes
Some very nice light designs. Sketchup and STEP files.
Maytoni
Archilume
Minimalist, but striking LED lighting products, includes some nice chandeliers
Tokio.
Utu soulful lighting
LED Luks
A few of their fixtures are on archiproducts
Arkoslight
Minimalist, modern light fixtures. Pendants, recessed, track, outdoor. I like the Alaska Trimless - a ceiling mount globe light - small and interesting.
Cameron Design House
Stunning chandeliers, a few of their simpler products have Revit downloads.
Liqui Contracts
Small catalogue of playful lighting
Ross Gardam
You need to fill in a form to request that they send you the 3D Files
Il Fanale
Italian brass lamps
Oblure
Really fun, playful lighting. A few revit files on archiproducts: https://www.archiproducts.com/en/oblure/products/bimtype_revit
Brokis.cz
Fun, lovely designs, but limited Revit files - some can be found on Archiproducts (for Memory, a "balloon-like" ceiling light). Lots of great designs, though. Perhaps can import sketchup files?
Zero Interior
In-es.artdesign
Cool moon light, a light that looks like a cheese grater, paint can lights. Many of these lights are available to download in RFA files (found in one big download at the bottom of their site)
Estiluz Official
Stylish, playful lighting. You have to register to get access to the 3D files, but once you do, looks like everything is available
A-N-D decorative luminaire design studio
Geometric and fun, but understated lighting. The "Button" light, for instance, that looks like a giant hanging button. Pipeline series, Vine series (looks like grapes, sort of), Pebble series, Slab series (acoustic).
Vistosi
Bomma
Fun, dramatic lights - I used the phenomena blown glass orb floor lamp in my hospitality project. Revit files can be found on Archiproducts.
Leucos