Lightingwise 4 FT 3000K T5 HO Fluorescent Grow Light Bulbs - Pack of 1,4,8,20,40 (40, 3000k - red - bloom) Choose between qty's of 1,4,8,20,40 54W T5 Light Bulbs Choose between color temperature - 6500k or 3000k Light output: Lumen - 5000 Dimensions: Length - 45.12" / Diameter - .62"