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Check the lumens rating on the bulbs. Lumens is the measure of light emitted by the bulb. Wattage only says how much energy the bulb will draw, not how much it will put out. e.g. the same manufacturer sells these two bulbs: 1. 15W 850l = 58l/W 2. 25W 1050l = 42l/W The second one uses 66%...