I won't go into detail here; Other people have written much better reviews, which I'll do in a moment. What I want to say is this: a) They work great in John Deere X540 lawn tractors. b) They are almost the same size as the stock 1156sc bulbs.) They appear brighter but this may be due to the color the temperature being much higher and they produce purely white/blue light. They will definitely make you more visible when driving your tractor. d) The heat generated should not be a problem as the 1156 bulb also generates a lot of heat.
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