In their enlarger? I recently tried this Feit 14w (60w) LED
in my Beseler 23C ll condenser enlarger. I used Ilford Multigrade RC paper and Ilford filters and a quick test provided good results. The "bulb" is rated at 3000k and with several split filter prints I was able to get the tonal range I was looking for. Once my computer is repaired I'll post scans of my prints.
My LED was $19.99 at Lowes.