bulbs

what the difference between the 3157 4157 ??? it only the wattage right>????

 

#3157 MINIATURE BULB PLASTIC WEDGE BASE - 12.8/14.0 Volt 2.1/0.59 Amp S-8, Plastic Wedge Base, 32/3 MSCP C-6/C-6 Filament Design, 1,200/5,000 Average Rated Hours, 2.09" Maximum Overall Length.

#4157K KRYPTON LONG LIFE MINIATURE BULB PLASTIC WEDGE BASE - 12.8/14.0 Volt 2.23/0.59 Amp Krypton Filled Long Life S-8, Plastic Wedge Base, 32/3 MSCP C-6/C-6 Filament Design, 4,000/10,000 Average Rated Hours, 2.09" Maximum Overall Length.

Looks like the 4157 is draws slightly more current, is a gas filled bulb and is supposed to last longer.

 

but they both fit the same plug right and work fine???

 

Looks that way to me.

 

thanks, so why they made it different???