The fuse in the lights are rated at 3 Amp (yes...Christmas lights- led type)...
The solid state is rated at 2 Amp...
yeah, I'll check the current...
Check the current, but I'm pretty sure you'll be fine. Power = voltage x Current, so 3 Amps is more than 300W! That would be a ship-load of power (and light) for a string of Christmas lights... Especially LED Christmas lights.
Is there a Wattage rating listed somewhere? I looked-up a string of 70 LED lamps online, and it's rated at 4.8W (0.04 amps = 40 mA). That "feels" about right to me.
The only "gotcha" could be an "inrush" current when the lights are switched-on. Highly unlikely, and the only you'd find that is if you smoke a relay.