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To answer this question the voltage of the bulbs is needed.

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Q: How many 3watt bulbs can be run off a 500va transformer?
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at first point you should determine the also the secondary voltage of the transformer, secondly you should explain what is the application of this transformer. if you want a special transformer, it is you to decide how much power is needed to be transferred via transformer, and designer tells you it is economical or not. by the way, if i want to refer you to a standard close to your application, following sizes are available for a 20kv/400v transformer: 50kVA,100kVA, 150, 200,315,500,630,800,1200,1600,2000,2500 and 3500kVA i hope this helps you


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