Go Go Gadget Flashlight
Enlightened
Don't know the candlepower, but the last one I worked on was 400W. Metal-halide, I think...
The advntage of LEDs, which probably won't come until we have one more generation of emitters that can put more light out of a single LED, or maintain the 100 lumen per watt seen at lower power, at higher outputs. The LEDs can potentially be more efficient by using separate optics on each emitter to have greater contorl over the light distribution than with a single point source and reflector. While a lot of HID lamps put out 100 lumens per watt or more, the optics/fixture losses are typically greater, and regularly I see at least half of the lumens coming out of the fixture completely wasted by throwing them over unused/unoccupied land, or up into space.I'm asking solely to see if it would be feasible to replace a streetlamp with a LED alternative while maintaining or increasing the candlepower and maintaining or reducing the power usage.
There are white LEDs that have 3x the efficiency of amber LEDs, and in the case of the white, you're not stuck with monochromatic amber light. I don't know why anyone woudl explicitly want to reproduce a low pressure sodium spectral output.The larger ones come to 150lm/W, thats about 5-6 times what the best amber LEDs will do.
A 180W low pressure sodium will come to about 3-5,000 cd