There are many LED PAR38 lamps out in the market but not many with the power to effectively replace 250W-500W incandescent lamps. Fortunately the new GE 32W Dimmable LED PAR38 can do the job as it puts out 3000+ lumens and is available in various color temp and beam angle configurations.
The GE LED32DP38W series comes in 3000K or 3500K and in 15° Spot, 25° Narrow Flood or 40° Flood beam angles. They are quite efficient as well, delivering 3000 lumens on 32W for the 3000K (93.75 LPW), and 3100 lumens on 32W for the 3500K (96.88 LPW).
These lamps are dimmable and if you intend to dim them, it would be wise to test some out to ensure they are compatible with your system.
Rated for 25,000 hours with a 3 year manufacturer warranty from GE. Energy Star rated and suitable for outdoor use as they are wet-rated. Order below: