Size & Watt: 12W 22x22x8cm, 24W 30x30x8cm, 36W 40x40x8cm，. 24W: 30 x 30cm/11.81 x 11.81"(Lighting Area 5-8m²). 1X Square Ceiling Light（ optional size ）. - Safety lighting: No flash, no glare and no radiation, more healthy to your eyes.