Reading USB Relay Specifications
The "DC30V 10A" means that it can switch DC voltages up to 30V, at currents up to 10A.

Switching DC is more difficult than switching AC, which is why you might see "250VAC 10A" on the same device.

So the basic answer to your question is 'Yes'.

Incandescent light bulbs do draw much more than their rated current when you first turn them on (because they're cold), so your 5A lamp might be quite hard work for the relays.  However switches usually struggle more with turning off than turning on, so you'll probably be OK, at least within the margin of confidence you can have in the rating of cheapo relays.