Lamp grade comes in two consistencies. The most popular is PEA, it is the consistency of small pea gravel. Also there is ROCKS size, which is larger chunks than the pea size, from 3/8" to 1 1/4". PEA size is commonly used in smaller lamps like those on miner's caps. ROCKS are usually used in the larger lamps, like car lamps, and railroad lamps. If you need carbide for your sight smoker, the pea size is what is commonly used for that purpose.
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