If you were putting our computing resources head-to-head (my Pi vs his Spartan FPGA), sure. But you have to consider that the LED strips in both of our systems

If you were putting our computing resources head-to-head (my Pi vs his Spartan FPGA), sure. But you have to consider that the LED strips in both of our systems are the most power-hungry part, potentially drawing up to 1A per meter. Taking that into account, the difference in power drain for our respective computing resources would be dwarfed by the power requirements for the LEDs, such that the difference is near negligable.