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Found these LED lights while doing research for LED landing light options based on a Brand X aviation Forum... WOW side by side they are at least 3 times brighter than the GE 4509. They come it two versions Spot / Wide angle... ie Landing & Taxi. Installed both to test... All I can say is WOW! Paid $110 each factory new from factory online dealer, had them shipped in 2nd day for less than the cost of one Aircraft Spruce Whelin LED unit. Talk about bright.... Also you can interchange the lens if you want to go from wide angle to spot or vise versa... One drawback if it is a drawback at all, is I cant check it and tell when it is on by watching the AMP draw... Dont know if I will keep them installed or not because I don't know the legality of using them. When I talked to the factory they stated they are an "exact replacement for the PAR36 and brighter than the 4509" and they were! Fit perfect took about 20 minutes to swap both. NOTE, had to keep the longer screws from GE 4509 as in my case my bird has two bulbs and the eye terminal ends are double stacked, requiring an easier fit with the longer GE 4509 screws. The others would have worked just easier with the slightly longer screws. Another thing I like is they are a well know very long time successful US company GROTE. They appear to be very well built, heavy with excellent heat sink die cast housing... The most important part of any LED bulb. Something like 11 - 30 VDC if I recall correctly. They are specifically designed and targeted for extreme service on earth and heavy equipment and tractor service.. Just thought I would share, any feedback on the legality of using them would be appreciated.