This unit is voltage regulated from 9 to 36 VDC however comparing a 24/28 volt supply to a 12/14 volt supply, a 15% output loss (watts and Lumens) at 12/14 compared to 24/28 volt operation. At 75F degrees (24C) ambient temp., output is reduced to about 80% output after about 5 minutes of operation,with all 30 LEDs lit. After 5 minutes of use at those same ambient temps, about 50 watts using only 18 landing LEDs. Also about 75 watts with all 30 LEDs lit after that same 5 minutes. Peak Lux at 26VDC 12% less (13VDC 20%) than Aero LEDs 36-4596 100 watt unit at 26VDC using all 30 LEDs 40% less (13 VDC 50%) Lux than The Aero LED using the 18 landing LEDs. This unit does not loose output due to temperature nearly as quickly as the Aero LED unit does. It also offers more options (flexibility) built in wigwag features, and 3 illumination modes, Landing (18 LEDs, taxi (12 LEDs) and both (all 30 LEDs), lower 1/2 output settings for all 3 modes. It also offers wigwag. All in all, we will use this for wigwag dual recognition lighting and taxi operations. We will keep using HID systems for landing since there are still no LED units that can come close to the performance of HID for a true (far reaching beam) landing light especially the 50Watt and higher HID wattages. HID does not loose brightness at all as it warms up. I would not recommend this LED or the Aero LED units for any cowling locations, NO LED unit will perform well there. They get too warm (ambient air temps) to have much output in those locations unless they are directly ducted with cooler outside air. We were hoping that LED would be a good total solution but its not there yet even now in 2018.

These are super landing/taxi lights. On the Hercules light being for experimental category aircraft only: I think not. The Hercules lamp, without the bracket, is a virtual drop in for the standard 4509 or 4509Q landing lights. FAR Part 43 allows owner/operators to replace bulbs as long as they are of the same rating. The Hercules is rated at 14 volts 100 watts, virtually the same as a 4509. There is no requirement to get an approval if you install a replacement bulb from a different manufacturer. Part 43 does indeed allow you to replace bulbs of any kind at will, so long as you use something that doesn't draw any more power or require any major modification to the frame. Unless you are rewiring the landing light circuit to use the various optional functions that the Hercules allows: hi-low, wig-wag, you only need to make a simple log book entry, no 337 form, no A&P sign-off required under Part 43. If you want the other options, an A&P can sign it out, again without a 337.