var instance = new Vintasoft.Twain.WebTwainDeviceJS(deviceName, productFamily, manufacturer, driverVersion, twainVersion, deviceManager, is64Bit);

var value; // Type: boolean
value = instance.get_LampState();

function get_LampState() : boolean;

Return Value

This property sends a synchronous request to get value of WebDeviceCapabilityIdEnumJS.ILampState capability. If you want to use asynchronous request instead of synchronous request, please get information about WebDeviceCapabilityIdEnumJS.ILampState capability using WebTwainDeviceJS.getCapabilityAsync or WebTwainDeviceJS.getCapabilitiesAsync function.

Reference

WebTwainDeviceJS Class
WebTwainDeviceJS Members