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What’s the difference between the R125 heat lamp and the r40 infrared heat lamp?

R125 infrared heat lamp mean the outer diameter of the bulb is 125mm,
the R40 heat lamp bulb mean the bulb shape,
they are the same. please see the following:

They are the hard glass infrared lamp, the hard glass is splash proof, so the infrared heat lamp is widely used for livestock, for example, for pig heaters, piglet heater, heat lamp bulb for chickens, etc.