Dear Doungjai,
please note this is normal as the machine was tested twice, at the manufacturer and at Siro again.
I have talked to our technicians, the lamp can already look a little bit milky but this is no problem for the lifetime at all.
Please be assured it is a brand new lamp in the machine.
But for the satisfaction of your customer we will send you a new lamp from our stock, please arrange to return the lamp to us with your next shipment.
Is it OK to send the lamp with the SL50E? Please confirm so we will proceed with shipment of machine + lamp.
Thank you for your quick reply.