Taillight bulb question. P21/5W vs 1157?
#1
AudiWorld Super User
Thread Starter
Join Date: Apr 2001
Location: Dallas, Texas, USA
Posts: 7,861
Likes: 0
Received 0 Likes
on
0 Posts
Taillight bulb question. P21/5W vs 1157?
What's the difference. The taillight says <a href="http://www.donsbulbs.com/cgi-bin/r/b.pl/p21%7c5w.html">P21/5W</a> on it, but for some reason I had been looking for an <a href="http://www.donsbulbs.com/cgi-bin/r/b.pl/1157.html">1157</a> (I guess I got the info here?) According to <a href="http://www.donsbulbs.com/">Don's Bulbs</a> they have the same base (BAY15D), so what's the difference? I guess looking @ the list below, the 1157 is supposed to be brighter, but the P21 lasts longer. The 1157 also draws a bit more juice. Though the reason I am curious about this is cos I found some <a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=8041594133">1157 LED bulbs</a> (yeah, I know, they won't be bright enough, yadda yadda yadda) that I would like to try, which actually makes me less worried about the amperage.
<blockquote><b>P21-5W/12V/21W/5W/BAY15D ECE bulb specifications:</b>
category: MINIATURE
volt: 12
amp: 1.75 / .417
watt: 21 / 5
base: BAY15d - Double Contact Index Bayonet
glass: S8
filament: C6/C6
fil.res.: 6.86 / 28.8 ohm
m.o.l.: 2 inches
l.c.l.: 1.25 inches
i.lumens: 264 / 75.4
cp: 21 / 6
d.hours: 1000 / 200
notes:
automobile lamp
clear glass
FOR 6 VOLT USE: 1154 USA
FOR NEAR SUBSTITUTION USE: 1034 USA
indicator lamp
incandescent
stop lamp
tail lamp
<b>1157 USA bulb specifications:</b>
category: MINIATURE
volt: 12.8 / 14
amp: 2.5 / .214
watt: 32 / 3
base: BAY15d - Double Contact Index Bayonet
glass: S8
filament: C6/C6
fil.res.: 5.12 / 65.4 ohm
m.o.l.: 2 inches
l.c.l.: 1.25 inches
i.lumens: 402 / 37.7
cp: 32 / 3
d.hours: 600 / 5000
notes:
automobile lamp
clear glass
incandescent
motorcycle
stop lamp
tail lamp</blockquote>
<blockquote><b>P21-5W/12V/21W/5W/BAY15D ECE bulb specifications:</b>
category: MINIATURE
volt: 12
amp: 1.75 / .417
watt: 21 / 5
base: BAY15d - Double Contact Index Bayonet
glass: S8
filament: C6/C6
fil.res.: 6.86 / 28.8 ohm
m.o.l.: 2 inches
l.c.l.: 1.25 inches
i.lumens: 264 / 75.4
cp: 21 / 6
d.hours: 1000 / 200
notes:
automobile lamp
clear glass
FOR 6 VOLT USE: 1154 USA
FOR NEAR SUBSTITUTION USE: 1034 USA
indicator lamp
incandescent
stop lamp
tail lamp
<b>1157 USA bulb specifications:</b>
category: MINIATURE
volt: 12.8 / 14
amp: 2.5 / .214
watt: 32 / 3
base: BAY15d - Double Contact Index Bayonet
glass: S8
filament: C6/C6
fil.res.: 5.12 / 65.4 ohm
m.o.l.: 2 inches
l.c.l.: 1.25 inches
i.lumens: 402 / 37.7
cp: 32 / 3
d.hours: 600 / 5000
notes:
automobile lamp
clear glass
incandescent
motorcycle
stop lamp
tail lamp</blockquote>
#2
They're the same, only different...
1157 is a US designation, P21/5W is a European designation. They're slightly different in specs, but interchangable for this application.
A closer US cross is a 7528, but that's probably less common in the US than a real P21/5W.
Note that the usual LED bulbs will NOT work properly with reflectors designed for incandescent bulbs.
A closer US cross is a 7528, but that's probably less common in the US than a real P21/5W.
Note that the usual LED bulbs will NOT work properly with reflectors designed for incandescent bulbs.
#3
AudiWorld Super User
Thread Starter
Join Date: Apr 2001
Location: Dallas, Texas, USA
Posts: 7,861
Likes: 0
Received 0 Likes
on
0 Posts
Actually I think these may...
<center><img src="http://www.maxspeed-motorsports.com/maximages/360LED10.jpg"></center><p>They have an omni directional design to them. Having played with LEDs I know that even supposed 'wide angle' LEDS aren't, but these bulbs are actually cylindrical in shape with the LEDs mounted around the outside and on the end.
#5
AudiWorld Super User
Thread Starter
Join Date: Apr 2001
Location: Dallas, Texas, USA
Posts: 7,861
Likes: 0
Received 0 Likes
on
0 Posts
True, I expect they will still have an odd speckly directional effect.
Oh & thanks for the info. Glad to know they won't explode or anything. ;^)
#7
AudiWorld Super User
Thread Starter
Join Date: Apr 2001
Location: Dallas, Texas, USA
Posts: 7,861
Likes: 0
Received 0 Likes
on
0 Posts
Heh...it's on purpose. If you look closely you can see the silhouette of the car.
Just kind of a carryover from previous sigs.<ul><li><a href="http://homepage.mac.com/maxhedrm/TTSigs.html">http://homepage.mac.com/maxhedrm/TTSigs.html</a</li></ul>
Thread
Thread Starter
Forum
Replies
Last Post
SpeedyDTP247 CQ+UrS4
Audi 90 / 80 / Coupe quattro / Cabriolet
5
12-18-2007 06:06 AM
MC Hammered
A4 (B7 Platform) Discussion
6
09-09-2006 02:54 PM
AutosportMan
Audi 90 / 80 / Coupe quattro / Cabriolet
5
04-15-2004 08:50 PM