Lights and photoreal issues

[mtaxp]

Hello,

In creating a scenery I noticed 2 things:

1) when compressing png to dds I get some "squares" on each photreal tile , I understand that it's due a limitation of DDS colors compraing to PNG , however is there any way that I could "smooth" it a bit?

 

2) When creating custom lights they are also turned ON at day mode , how can I make them behave like the default light? (turned off at day and turned on at night)

 

thanks!