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got 3 plants growing inside under 400 watts MH been budding about a month one of the plants leaves at the top are pale green and tips are curling under also the tips are turning brown and they are britle the other 2 plants are doing great all have been watered/fertilized exactly the same...

High Pressure Sodium, Metal Halide,or Mercury Vapor.Which is best for vegatative, and which is best for flowering

will a 500 watt halogen effectively grow a few plants or should i get a HID or Mercury or Sodium vapor. Which would be best?