why do you blow off candles?

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Almost everyone here on mylot,must be celebrating someone's birthday now and then. Indian culture is very different from that of the western. We celebrate birthday by putting 'Tilak' on the forehead,putting sweets in the mouth,etc,etc. But following the western culture many of us have also started cutting cakes and blowing off candles.I agree, that I too celebrate in the same way. But this year, when my son was 4, after cutting cakes I did'nt let him blow off candles. Reason- One of the YOGA specialist Swami Ramdev says that its the special occassion, we wish the person long life, then why do we you create darkness instead of enlightening the house. I was convinced 100%. Is there anyone on mylot who will convince me that blowimg off the candles, is right, or atleast give me the reason behind it?