The models that start with "2" are the littlest circular ceiling lamp we have, they measure 230-260mm. Common applications are Bathroom, Storeroom, Balcony, Yard, Helper room, Bomb Shelter. Powered by 2400 Lumens @18w, they are the most powerful in its form factor.

The models that start with "3" are middle child circular ceiling lamp we have, they measure 350mm. Common applications are bedroom, kitchen, Living. Powered by 3000 Lumens @28w, they are the most powerful in its form factor.

The models that start with "4" are the chunkiest circular ceiling lamp we have, they measure 450mm. Common applications are bedroom, kitchen, Living. Powered by 4000 Lumens @36w, they are the most powerful in its form factor.