Monday 4 May at 10:31 : May 4 (GMM) The concerns of organisers and drivers aside, Bernie Ecclestone insists F1's controversial new 'twilight' start-time concept has been a success

In Australia and Malaysia this season, the green light was delayed until 5pm local to better serve the bulk European live audience

In Melbourne, drivers complained about the light conditions, while a week later in Malaysia torrential evening rain left no time for a delayed race re-start

But to the Independent newspaper, F1's chief executive said the twilight concept is here to stay

"All our TV up to now has been up 300 per cent," said Ecclestone. "We have been getting more than 50 per cent of the market share."nnThe concept was a compromise in the face of expensive floodlighting, however Ecclestone told the newspaper that Sepang is now to join Singapore as a night race