For the flashing on tower I would use 3mm
For buildings you can use these,they are usually bright enough
http://www.ebay.com/itm/New-50...&hash=item3a38123e65
If you want ultra bright use these
http://cgi.ebay.com/100P-5mm-0...&hash=item439c7e8fae
Size resistors accordingly and pay attention to wattage.
These are also gaining favor
http://cgi.ebay.com/ws/eBayISA...299400#ht_4533wt_907
If any LED is too bright a larger than minimum resistor can be used.
Dale H
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