Electronic – Simulate Cree XLamp XB-D LED LTspice

The output of the AD8222 simulation makes sense. 250Ω for R1 gives you a gain of about 200. Input signal is 1V. The output would have to be 200V, and it gets clipped near the supply rails.
Lower the input amplitude, and/or the gain, and you should see a sine wave at the output.

The output of the LT1920 simulation doesn't readily make sense to me. The gain and the input are roughly the same, so I would expect it to swing and clip like the AD8222 simulation. Hopefully someone can spot the error there.

edit: The negative input pin (In-) in the LT1920 schematic looks odd. Maybe it not connected to ground.

I don't think you can add a + to indicate a line extension, its 1 line per model. It should look like the others. Here is an example:

.model RFNL5BM6S D(Is=778.9p N=1.419 Rs=25.53m Ikf=81.74m Eg=1.05 Cjo=93p M=513.2m Vj=714.8m Isr=358.2p Nr=3 Bv=600 tt=88.29n Tikf=18m Trs1=700u Iave=5 Vpk=600 mfg=Rohm type=FastRecovery)

Second thing, check your directory. The new LT spice places a folder in

 User\Documents\LTspiceXVII\lib\cmp\standard.dio

this is the one that needs to be edited.