repurposing — these things (from some discarded microwave ovens — another person has a specific use for the magnetron bias magnets from same) push through over 1kW, and they all seem to be functional thus far. driving them is... not quite as simple as it may appear, however, strapping in a second core may allow for magnetic leverage. for the cost... hmmm...
the LEDs on this 5m strip happen to emit light centred on a red that does unexpectedly helpful things to (and surprisingly deeply within) a human routinely exposed to it. it has been soldered to a Molex connector, plugged into a TFX power supply from a (retired: the MoBo is cactus) Small Form Factor PC, the assorted PSU connectors (and loose end from the strip) have been taped over. the LED strip cost $10.24 including postage, the rest cost $0, the PSU is running at 12½% of capacity, consumes less power than a laptop plug-pack despite running a fan. trial runs begin today.