[jshorva65]

My estimate of several hundred pounds was for a smaller tube (10BP4, etc.). Thank you for doing a better job of pointing out that the pressure is proportional to the size of the tube. Even the small 7JP4 and the smaller, bulbous 5" pre-war tubes can hurl shards of glass with surprising force. For that matter, even an ordinary tube or light bulb can shatter violently. Most light bulbs larger than 40W are filled with a gas which neither conducts electricity nor supports combustion. Light bulbs of 40W or smaller often will be evacuated and may implode if they are broken. Fluorescent bulbs will also implode if dropped since they contain a partial vacuum and a small amount of mercury vapor. Fluorescent bulbs also have phosphors on the inner surface of the glass which are often toxic. Cuts must be cleaned thoroughly.