Glass can only transmit between 80% and 90% light whereas acrylic can actually transmit up to 92% light. Acrylic also reflects light much better than glass which again makes it a good substitute for glass particularly in relation to windows.
Acrylic is a lot stronger than glass and where glass shatters, acrylic usually only cracks but if it breaks it does so into large but blunt edges. This is why they are very appropriate for windows as they are things that are more likely to receive some impact at one point in time.
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