The 500-watt models are far too bright for anything but industrial use. I had a cobra head streetlight modified using a tig welded finned 18" X 4" heat sink out the top. This piece is now a crosswalk street lamp that CFE erected and is paying the power bill. The 180 degree beam. Spread lights up the whole street area. Flatbeds hauling rebar speed through the pueblo and now all the children including my granddaughters are safer at night.CFE is also paying for a timer cobra head above the futbol field. Next is a pair of Nav Lights that will guide the pangueros in at night in case of an emergency. One light above the other and set back 10-meters.
I could not go stronger than 10-watts in the bus. Above each chip is CPU heat sink with integral fan. The living room warm white is on a dimmer. Diffused leaded glass lens marine fixtures. The variable power supply and IR thermocouple are a godsend in lighting design where heat dissipation is a nightmare. Dial the voltage back on the bucker.
BTW few commercial fixtures are driven to chip advertised potential. Again the issue is inadequaye heat-sinking. A 100-watt outdoor fixture is commonly driven at 70-watts. E=MC2 design does not work unless a big heat sink is used. Look at 10-watt LED heat sinks on eBay to get a perspective. They are circular, 90 mm with lots of radial fins.