Theoretically yes, but it must be ensured that the converter is not only DC-capable, but also complies with the special regulations of EN60598-2/22 (2014). Here it is stated, for example, in point 22.7.3 that emergency luminaires must have a protective device that disconnects the luminaire from the supply in the event of a fault. This disconnection requires, among other things, a mains input fuse approved for DC fault conditions, which is not standard in normal operating devices for general lighting, even if the devices are approved by the manufacturer for operation at DC voltage.
