Ballast: help start metal halide lamp, sodium lamp, from 70-400W regular, copper type and aluminium type, low price,high quality Ballast:1. low prices, high quality2. help start metal halide lamp, sodium lamp, with good starting capability.3. copper and aluminium type, for 70-400W regular, 600W, 1000W also available 4. with different models, also have most popular models Ballast
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