Ray - I've been tinkering quite a bit with LEDs for our airplane. In fact last night I just completed a side-by-side test of two different compact LED units to be mounted in our engine cowling. And this is where things get interesting...
All LED lights are not created equal!
The $100 light, rated at 1000lm has a diffuser so it produces a broad beam of light. The $33 unit, rated at 750lm, is very clearly a spot beam. As expected, in testing the diffused light produced a very even distribution of light over a wide area, and had very little "throw". The spot beam light produced quite amazing throw for what is claimed as a 750lm output. I have subsequently chosen to go with the spot beam light as a pair of them in the cowl will provide what appears to be an illumination pattern at least equal to a GE4509 incandescent bulb.
Now for the kicker. The $100 light will break squelch on my Icom IC-A24 radio, when squelch is set to 10, at a distance of 4-6 feet. Under the same conditions the $33 light breaks squelch at 20 feet. Clearly I will have to install some external filtering if I want to use the cheaper lights which produce a more intense beam.
Oh, the cheaper light also weighs 20% more than the expensive light.
All of this to say that you should buy the lights you want, then take the time to characterize them before committing to an installation. The ones you have selected may be good, bad, ugly, or somewhere in between. With LED's it seems one often gets what one pays for.
As an aside, if you want LED landing lights that REALLY work, do a search here on Baja Squadron lights. Not cheap. They are electrically quiet, breaking squelch at 3 feet or less. I have a pair of them in the wingtips and they are extremely bright - each one of them producing more than twice the light of a GE 4509 bulb. If you're like me and are concerned about running into critters on the runway at night, these babies are definitely capable of providing an enhanced margin of safety.