Mate of mine who drank singha lite @ 3.5% now saying its been bumped up to 4.5%

I dont touch singha with a barge pole, so not able to comment

He is shifting to Tiger Light @ 4.1%

Yes it has been available for a while - the blue necked version..
Supplies of the 3.5% version seem to have finally been exhausted in Udon!!

4.5% hardly sounded 'light' to me, unless you are comparing it to the Belgium imports..
Leo is 5%, not sure what the standard Singha is???

The Singha 4.5% light with the blue top is low calorie but most importantly it is low in sugar, suitable for diabetics as is the San Miguel.