what size base does the bulb have?
330518
This HPS is a S55 mogul base, and doesn't produce heat as much as other HPS fixtures.
686562
Its a regular bulb base i don't recommend these though not much light emitted from these.
526193
overall length of the bulb is 4" including base of which the base is 1/2" and the glass is 3 1/2"
1531259
I'm not really sure about that. The have a standard size threaded base but the bulb itself is large at about 5 inches wide and 8 inches long, so take that into account.
1266720
I don't recall the size, but you can locate it on the Exoterra site. I returned mine because none of the local stores carried that size bulb. I purchased two 18" instead; bulbs are readily available at pet stores.
1912601
The base worked fine in my fixture. The circumference of the bulb was a bit larger than the ones they replaced
1912604
It's an E12 base, i.e. 12 mm (a little less than half an inch) in diameter. It fits standard U.S. chandeliers with small-diameter sockets..
110764
This bulb does not state "E12" anywhere on its packaging. However, the candelabra base does have a diameter of 12 mm.
1330905
The bulb is 4 3/4 inches from the tip of the flame to the end of the base. The diameter is 1 5/8 inches.
2163127
The base is the same size as the base on a standard incandescent light bulb. I have a spare sodium bulb and just tried putting it in a standard household lamp. It fits the lamp base the same as a standard bulb would. Of course I did not turn the light on for obvioius reasons. Used the LU70 to replace a Grandlite HPS 70W. Hope this helps.
730008
It is the same base that is on a 4 watt Christmas tree shaped bulb used in many nightlights. My wife needed a bulb for a makeup mirror and the standard nightlight bulbs did fit but were not bright enough.
13124
It is a standard base. Not sure the length. I use for a child's lava lamp nightlight.
83040
The bulb I bought did not fit the lamp I had because of the pin configuration. I no longer have the bulb or the lamp it was purchased for. I believe the bulb was about 6" long, but I can't be certain. This was very frustrating for me.
1486154
This LED replacement bulb has a so called P13.5s single contact miniature flanged base, which has a flange diameter of 0.530" (13.5 mm), a below flange base diameter of 0.360" (9.14 mm), and a flange to contact length of 0.580" (14.8 mm), for example, the BulbTown webpage gives about the same base dimensions: http://www.bulbtown.com/Single_Contact_Miniature_Flange_Base_P13_5S_s/1014.htm
328832
Not sure what the diameter of the base is. It mounts to a flat plate that hooks in just like a normal light fixture.
1262370
This is the same size as a standard lightbulb base, can't remember the correct term for what it's called. I don't know about the other part of your question.
2276013
It has the A19 base like a standard lightbulb. We use it in a desk lamp so the bulb is not too big.