Thanks everyone,
The frequency band for LoRa in Singapore, based on the LoRaWAN_Regional_Parameters_v1_0 is 920-925 MHz as mentioned before, but my main question is concerning the Singaporean laws regarding the available ISM bands. I have contacted the authorities but haven’t heard anything back. Another issue is that some nodes are using EU868 MHz frequency band in Singapore which doesn’t seem to be illegal, but perhaps just inconsistent with new LoRa Spec?