To decorate big tree of 5-7 meter and required the lights go on over 5 years without any maintenance (10 hours per days lighting), the M-LIGHT CHAIN with 5-way connector-ring will be met the requirement due to the short-circuit proof IP64 Outdoor Transformers, unbreakable & water-proof M-LIGHT BULBS. There are three sizes of the profi-tree lights: 10 x 28 bulbs = 280 bulbs for tree of 5 meters 10 x 38 bulbs = 380 bulbs for tree of 6 meters 10 x 48 bulbs = 480 bulbs for tree of 7 meters M-LIGHT BULBS used Type 120501 12 Volt 0.5 Watt Optional: 10 x 14 bulbs = 140 bulbs for tree of 3 meters 10 x 18 bulbs = 180 bulbs for tree of 4 meters 10 x 24 bulbs = 240 bulbs for tree of 5 meters