18W 20W 36W 40W 58W Magnetic ballast , low loss consumption, no noise, low temperature rise ,long life 220V110V Features:1)Metal housing2)Earth connected3)Low loss power consumption (EEI=B2 grade)4)Glare-free and no noise,low temperature rise.5) 220V-240V5)Specifications: 1 x 18W(20W) 1*36W (40W)6) long life: over 5 years7) suitable for both straight fluorescent tube or circular tube