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Lighting - Historical
Applied By ChapmanF: Oct 10, 2012 at 11:03 PM
(History)
Lighting
A reference list of the original lights in the NHW11 Prius. This may be useful to those considering LED retrofits, as well as those who just want to find the original-style replacements.
About LED retrofits
Many questions arise in the forums about suitable LED replacements for the original lights. This is trickier than it may seem. A suitable replacement should have lumen output comparable to the original, and also emit light in a pattern that works with the original reflector and lens. As of this writing (late 2012), while there are many LED bulbs to be found online with bases that will fit the original sockets, it can still be hard to find one with comparable lumen output to the original light.
For example, the only 31mm dome light replacements I have seen that come near the original 90-some lumens are those built with nine or more LED chips on a flat PC board that extends like wings at the sides of the package. The car's dome light fixture is shaped in a way that might interfere with the fit of such a package.
LED assemblies can try to replicate the omnidirectional light pattern of the original (usually by being studded with small LED chips facing in many directions), or shine a narrower beam out the end (axially, away from the socket), or just in one direction out the side (this design seems to be called 'flank' in the marketplace).
The reflectors and lenses for all of the legal signaling requirements were all designed for truly omnidirectional light sources, and they have to meet legally imposed standards on how much lens area is illuminated at what intensity. These will be the most tricky to retrofit with LEDs in a way that will meet the necessary standards. There is a lot more flexibility to experiment with the interior lighting. The license plate lights might be a borderline case.
More on LED beam patterns
The basic terms describing LEDs for sale (beam angle, axial, omni, flank, etc.) do not always tell you everything needed. For example, a 'flank' LED version of a wedge-base bulb like a 194 is usually built on a single flat circuit board. If the wedge socket is aligned up-and-down, the LED will wind up shining right or left. But what about the license plate lights, where the socket aligns up-and-down but the light needs to shine down? That kind of 'flank' LED is harder to find.
I hope that others who do find good LED replacements for any of these bulbs will add the details on this page.
General notes:
Toyota part numbers from toyodiy.com by looking up a 2001 North American/USA model. Others may vary.
Lumens = MSCP × 4π (or about 12.57). As of this writing, Don's database has a lot of errors where a bulb's MSCP rating got entered as lumens, and then the CP figure is shown as 1/12.57 of that. When that happens you can get the correct figures just by multiplying Don's figures by 12.57.
Numbered notes:
1. 7440A for amber signal if lens color is clear
About LED retrofits
Many questions arise in the forums about suitable LED replacements for the original lights. This is trickier than it may seem. A suitable replacement should have lumen output comparable to the original, and also emit light in a pattern that works with the original reflector and lens. As of this writing (late 2012), while there are many LED bulbs to be found online with bases that will fit the original sockets, it can still be hard to find one with comparable lumen output to the original light.
For example, the only 31mm dome light replacements I have seen that come near the original 90-some lumens are those built with nine or more LED chips on a flat PC board that extends like wings at the sides of the package. The car's dome light fixture is shaped in a way that might interfere with the fit of such a package.
LED assemblies can try to replicate the omnidirectional light pattern of the original (usually by being studded with small LED chips facing in many directions), or shine a narrower beam out the end (axially, away from the socket), or just in one direction out the side (this design seems to be called 'flank' in the marketplace).
The reflectors and lenses for all of the legal signaling requirements were all designed for truly omnidirectional light sources, and they have to meet legally imposed standards on how much lens area is illuminated at what intensity. These will be the most tricky to retrofit with LEDs in a way that will meet the necessary standards. There is a lot more flexibility to experiment with the interior lighting. The license plate lights might be a borderline case.
More on LED beam patterns
The basic terms describing LEDs for sale (beam angle, axial, omni, flank, etc.) do not always tell you everything needed. For example, a 'flank' LED version of a wedge-base bulb like a 194 is usually built on a single flat circuit board. If the wedge socket is aligned up-and-down, the LED will wind up shining right or left. But what about the license plate lights, where the socket aligns up-and-down but the light needs to shine down? That kind of 'flank' LED is harder to find.
I hope that others who do find good LED replacements for any of these bulbs will add the details on this page.
| Column 1 | |
|---|---|
| 0 | [tr][th]Function[/th][th]Toyota #[/th][th]Common #[/th][th]Best Don'sBulbs match[/th][th]Consumption (watts)[/th][th]Output (lumens)[/th][th]Notes[/th] |
| 1 | [/tr][tr][td]Headlight[/td][td]90981-13055[/td][td]HB2 60/55[/td][td]hb2[/td][td]60/55[/td][td]1650/905[/td][td][/td][/tr] |
| 2 | [tr][td]Parking lt[/td][td]99132-12050[/td][td]947?[/td][td]w5w-5w-12v-w2.1x9.5d[/td][td]5[/td][td]50[/td][td][/td][/tr] |
| 3 | [tr][td]Front turn[/td][td]90981-15011[/td][td][/td][td]7440a[/td][td]21[/td][td]460[/td][td][/td][/tr] |
| 4 | [tr][td]Side marker[/td][td]90981-11020[/td][td]194[/td][td]194[/td][td]3.8[/td][td]25[/td][td][/td][/tr] |
| 5 | [tr][td]Rear turn[/td][td]90981-15014 or -15011[/td][td]7440 or 7440A[/td][td]7440[/td][td]21[/td][td]460[/td][td]1[/td][/tr] |
| 6 | [tr][td]Stop/Tail[/td][td]90981-11048[/td][td]7443[/td][td]7443[/td][td]21/5[/td][td]440/35[/td][td][/td][/tr] |
| 7 | [tr][td]Reverse[/td][td]90981-11059[/td][td]921[/td][td]921[/td][td]18[/td][td]264[/td][td][/td][/tr] |
| 8 | [tr][td]License[/td][td]99132-12050[/td][td][/td][td]w5w-5w-12v-w2.1x9.5d[/td][td]5[/td][td]50[/td][td][/td][/tr] |
| 9 | [tr][td]Center high stop[/td][td]99132-12050[/td][td][/td][td]w5w-5w-12v-w2.1x9.5d[/td][td]5[/td][td]50[/td][td][/td][/tr] |
| 10 | [tr][td]Dome[/td][td]90981-14011[/td][td][/td][td]FESTOON/12V/8W/31MM/11MM[/td][td]8[/td][td]~ 96[/td][td][/td][/tr] |
| 11 | [tr][td]Map[/td][td]90981-12005[/td][td][/td][td]SR12V8WMB[/td][td]8[/td][td]~ 96 ?[/td][td][/td][/tr] |
| 12 | [tr][td]Coin tray[/td][td]90981-11018[/td][td][/td][td]74[/td][td]1.2[/td][td]6 ?[/td][td][/td][/tr] |
| 13 | [tr][td]Trunk[/td][td]90981-11020[/td][td]194[/td][td]194[/td][td]3.8[/td][td]25[/td][td][/td][/tr] |
| 14 | [tr][td]Center cluster illum.[/td][td]90010-01039[/td][td][/td][td][/td][td]0.91[/td][td]~ 2 ?[/td][td]green cap[/td][/tr] |
| 15 | [tr][td]Combination meter indic.[/td][td]90010-06019[/td][td][/td][td][/td][td]1.12[/td][td][/td][td][/td][/tr] |
General notes:
Toyota part numbers from toyodiy.com by looking up a 2001 North American/USA model. Others may vary.
Lumens = MSCP × 4π (or about 12.57). As of this writing, Don's database has a lot of errors where a bulb's MSCP rating got entered as lumens, and then the CP figure is shown as 1/12.57 of that. When that happens you can get the correct figures just by multiplying Don's figures by 12.57.
Numbered notes:
1. 7440A for amber signal if lens color is clear
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