Starlit is the derailleur brand of Spark Engineering Pvt. Ltd, a company established in 1989 in Ghaziabad, which is nominally in Uttar Pradesh, India, but is actually a suburb of New Delhi.
Spark Engineering also produce transmission parts, notably freewheels, under the Nervar brand (a long established French brand name) and has produced various components, including derailleurs, under the Spark brand. The Spark Engineering website claims that 85% of their production is exported to European manufacturers - and I have seen a Nervar freewheel on a rather ‘inexpensive’ (let’s be polite now) Decathlon bike - but I don’t know if it was original equipment.
Disappointingly, the Starlit derailleur models that I have seen all fall under the general heading of ‘copies of Shimano Tourneys’. I am sure this makes good business sense, and warms the hearts of European manufacturers, but, for some reason, I had hoped that an Indian company might have come up with something a little more unusual or eccentric.