Why do people put candles outside their doors?

The light emphasises victory of good(light) over evil(darkness) and hence people who celebrate this festival light diya's in and outside their house. It's a beautiful tradition.

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Moreover, why do the irish put a candle in the window?

In the years since the Famine, as emigration left so many families missing a loved one at Christmas, the candle became more and more as a sign of welcome to a family member visiting home. Today, the president's residence, Aras an Uachtarain, puts a candle in the window to express welcome to returning emigrants. Also, why do you put a glass of water next to a candle? The burning candle heats the air above it, including the air that goes into the glass. As it does so, the air in the glass cools, and as it cools, the air pressure in the glass falls below atmospheric pressure. Water is drawn into the glass until the pressure is equalised.

Which Colour candles to use when praying?

Light your white candle in a quiet place where you can pray without distractions. How do I communicate with my ancestors? In addition to prayer, calling in your ancestors in meditation is likely the easiest and fastest way to feel their presence. Take time to sit in meditation for 10-30 minutes and specifically call in whichever ancestor by name you feel most connected to and ask them to talk to you!

Regarding this, are all candles the same brightness?

When you burn a candle, one of its unique properties is the brightness of its flame. Choosing the right wax plays an important role in making the candle burn brighter. Candles made with beeswax have a warmer-toned flame, and they are the brightest, comparing them to other waxes.