jdh said:
Im not sure about the rest of you, but, wasn't the idea behind LED's is to omit moving parts????
The downside of LEDs in the "traditional" format is that you have a limited number of LEDs and you have to take that light energy and spread it as wide as possible for good off-axis warning. So on a Lin6 or Impaxx6 head, for example, you have 6 LEDs and you have to get as much off-axis light out of it as possible. Of course, you only have x amount of lumens to play with out of those LEDs, so if you spread them widely you don't get the center intensity.
It's similar to a fire hose - if you have a fog pattern, you don't get much forward distance. If you have a stream/jet type pattern, you get lots of distance but very little coverage.
Now picture 12 LEDs, and focus them into a 10 (or so) degree wide beam. SUPER bright as you have the light of all 12 LEDs focused down that tight pipe. The problem is getting off-axis warning out of that. Ok, well let's rotate the light to get the off-axis. You get the best of both worlds. And, zero maintenance and lower amp draw.
Rotators {arguably} still provide the best warning patterns. They have a long 'dwell' time and a great 'snap' to them, and they provide great depth perception (to other vehicles) in nearly all conditions, something that strobe and uber-fast flashing LEDs are horrible at.
This is why the SLR beacon can meet Cal. Title 13 Table 2 (minimum 12,500 candela-seconds) where something like the L31 beacon, which is still one on the brighter beacons on the market, only meets Table 4 (125 candela-seconds minimum requirement). Yes, the difference between Table 2 and Table 4 is
100x the intensity.
Keep in mind that the motor in the SLR is not a little hobby-style motor that manufacturers used to use in halogen lights. It is a heavy duty stepper motor taken directly from the robotics industry. Also, it's direct drive so no worm gears to lubricate or get worn out. It's a dramatically different piece of technology. Federal Signal's 5-year warranty covers the electronics AND the rotator assembly.