12 volt 32 candlepower, 25 watts = 1143 "stock" IH # 142 458
(1156 is 32cp also, 27 watts, different bulb shape and filament design)
12 volt 50 candlepower, 37.5 watts = 1195
And here's one will almost definately melt your wiring: 13 volt 86 watts =1039 (aircraft bulb). I would suggest you not try this bulb. They're not long life bulbs anyway. A friend had a MD that he evidently wanted "stadium lighting" on and tried these. 1 light switch, 3 reflectors, and a big chunk of wiring harness later he was back in business.
Candlepower and watts are not the same thing, and I don't think there is a direct mathematical formula to convert the two. Candlepower is an "old" rating, watts is a newer rating.
I think one of the major aftermarket tractor parts companies were selling 1129 bulbs as 6 volt replacements. These are only 21 candlepower. 1141 is 12v 21cp.
Locally, auto parts stores stock only the 1156 of the above, the 1133 and 1195 can be special ordered and the NAPA store (handles Wagner bulbs) tells me the 1183 and 1143 are no longer available. 1183 is in the paper books, NLA when they try to order them. They all can be found online, though.
REMEMBER: brighter bulbs means more draw on electrical systems. Generators and regulators may neeed adjustment, some alternators may not put out enough amps, and some wiring may not be heavy enough to take the extra draw. The heat can melt solder also. I've had trouble with the factory wire in the 6 volt lights melting solder out of the contact when using 1183's. Bulb life can be shortened by the excess heat inside smaller than designed for enclosed spaces. Please don"t shoot at the messenger if any of the above happens to you.
Worn or burnt out or dull reflectors or dirty glass won"t be helped by brighter bulbs.
Andrew Ginter
(edited to add/clarify wattage, candlepower, and voltage ratings)
This post was edited by AG in IN at 14:14:14 10/08/10 2 times.
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