Question: Two variable plotting with inequality

I'm trying to plot 1/2*L*(14.4/(1.5+R)^2<=423e-6.  My L ranges are L=757.4e-6..1135.1e-6 and the R ranges are R=13.85..15.95.  I'm trying to filter some pumps based on their inductance and resistance, and they need to fall under 423 uJ.  I looked at some implicit plot commands but didn't see exactly what I needed.

 

Thanks!

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