The ATI 39W 36" Purple Plus T5 HO Lamp combines the properties of a full spectrum bulb with strong red and blue components, producing a bulb with excellent color rendition that works very well to bring out pinks, purples and reds in an aquarium. Recommended in combination with at least two or more other T5 bulbs. 34 inches from end of pin to end of pin. For 36" T5 high output lighting fixtures. Made in Germany.