| Here are the standard lamp sizes & wattages.
F59/HO 80 Watt
F59/VHO 140 Watt
F71,F72,F73/HO 100 Watt
F71,F72,F73/VHO 160 Watt
F79/HO 120 Watt
F79/VHO 180 Watt
When lamp sizes are measured the size usually includes the measurement from end of socket to end of socket.
If you measure an actual F71" lamp it is about 68 3/4" long. Add the sockets & you get 71".
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