Review on SAE Class 1 NanoFlare 4W Amber LED Strobe Light With 72 Flash Modes For Emergency Warning On Trucks And Vehicles - Sync-Able And Surface-Mounted Yellow Amber Grille Light For Police by Jonathan Roloff

These are awesomely bright, but the "internal logic" chip that allows them to flash is a problem if you are trying to use them as a "instant on" light. They take about .5 to .75 of a second to light up when powered up, as the logic tries to figure out what flash pattern you have selected. It doesn't matter if you have them constant on, or "strobe" there's a .5 to .75 delay.As a extra brake light, they are problematic due to the 'delay'. As a turn signal flasher they fail 100%. The turn signal "pulse" isn't long enough for the internal circuit to figure out what flash/on pattern to use, so they simply never light up at all.As long as you're aware of the limitations, it's a good product. It could be GREAT if they can figure out how to fix the DELAY problem.