New From VLED.....V3 Triton
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Joined: Mar 2001
Posts: 3,248
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From: Rochester, NY, USA
Alex,
Here's a question for you. With the size of the heat sink on the back of those bad boys, I've got to believe that the heat comes from resistance. Increased resistance usually means higher amperage. So are the high powered LED's now drawing as much current as conventional incandescent bulbs? If so, aren't we getting right back to the original problem - too many amps for the system to handle?
Tom
Here's a question for you. With the size of the heat sink on the back of those bad boys, I've got to believe that the heat comes from resistance. Increased resistance usually means higher amperage. So are the high powered LED's now drawing as much current as conventional incandescent bulbs? If so, aren't we getting right back to the original problem - too many amps for the system to handle?
Tom
Not quite
While electricity passing through a medium is going to encounter resistance (and therefore heat) the heat from an LED is totally different. Without getting into the specifics, higher-powered LEDs simply put out A LOT of heat.
V-LEDs claims 3x 3W Rebels. I know a single 630nm (red) Rebel at 700mAh (its full power capacity) will put out anywhere between 60-105lm. While thats around 8-9 watts for a single die, the junction temp of that die on the board will be around 275*F. At full power, that single die requires a heatsink of approximately 25mm x 15mm.
Lets say we drop the wattage to 3, that would drop the lumen output to about 20-35lm, and maybe the junction temp of a single die to about 180*F. Now lets put three together. Thats 60-200lm (being liberal here), but the heatsink requirements are going to be enormous of 180*F from three dies being so close together. So I can only conclude that either that heatsink is WAYY to small (which will leave you with a dead LED in a matter of months), or V-LEDs is lying on that lumen output.
Answering your question about amperage draw, its just a matter of math. They claim 3x 3W LEDs, so that 9 watts, and the equation for amperage is I=P/V, so I = 9/12 which is 0.75 amperes. Compared to a 3157 bulb which is 27W means they draw about 2 amps, so they are still more efficient in terms of electricity being transformed into light, but whether or not that is hitting your reflector and has coverage is another equation. Even though it MAY have more lumens at the die, a general PnP LED will not have the candlepower of a stock incandescent bulb.
While electricity passing through a medium is going to encounter resistance (and therefore heat) the heat from an LED is totally different. Without getting into the specifics, higher-powered LEDs simply put out A LOT of heat.
V-LEDs claims 3x 3W Rebels. I know a single 630nm (red) Rebel at 700mAh (its full power capacity) will put out anywhere between 60-105lm. While thats around 8-9 watts for a single die, the junction temp of that die on the board will be around 275*F. At full power, that single die requires a heatsink of approximately 25mm x 15mm.
Lets say we drop the wattage to 3, that would drop the lumen output to about 20-35lm, and maybe the junction temp of a single die to about 180*F. Now lets put three together. Thats 60-200lm (being liberal here), but the heatsink requirements are going to be enormous of 180*F from three dies being so close together. So I can only conclude that either that heatsink is WAYY to small (which will leave you with a dead LED in a matter of months), or V-LEDs is lying on that lumen output.
Answering your question about amperage draw, its just a matter of math. They claim 3x 3W LEDs, so that 9 watts, and the equation for amperage is I=P/V, so I = 9/12 which is 0.75 amperes. Compared to a 3157 bulb which is 27W means they draw about 2 amps, so they are still more efficient in terms of electricity being transformed into light, but whether or not that is hitting your reflector and has coverage is another equation. Even though it MAY have more lumens at the die, a general PnP LED will not have the candlepower of a stock incandescent bulb.
Last edited by Raptor05121; Dec 1, 2012 at 11:32 PM.
Senior Member
Joined: Mar 2001
Posts: 3,248
Likes: 2
From: Rochester, NY, USA
Not quite
While electricity passing through a medium is going to encounter resistance (and therefore heat) the heat from an LED is totally different. Without getting into the specifics, higher-powered LEDs simply put out A LOT of heat.
V-LEDs claims 3x 3W Rebels. I know a single 630nm (red) Rebel at 700mAh (its full power capacity) will put out anywhere between 60-105lm. While thats around 8-9 watts for a single die, the junction temp of that die on the board will be around 275*F. At full power, that single die requires a heatsink of approximately 25mm x 15mm.
Lets say we drop the wattage to 3, that would drop the lumen output to about 20-35lm, and maybe the junction temp of a single die to about 180*F. Now lets put three together. Thats 60-200lm (being liberal here), but the heatsink requirements are going to be enormous of 180*F from three dies being so close together. So I can only conclude that either that heatsink is WAYY to small (which will leave you with a dead LED in a matter of months), or V-LEDs is lying on that lumen output.
Answering your question about amperage draw, its just a matter of math. They claim 3x 3W LEDs, so that 9 watts, and the equation for amperage is I=P/V, so I = 9/12 which is 0.75 amperes. Compared to a 3157 bulb which is 27W means they draw about 2 amps, so they are still more efficient in terms of electricity being transformed into light, but whether or not that is hitting your reflector and has coverage is another equation. Even though it MAY have more lumens at the die, a general PnP LED will not have the candlepower of a stock incandescent bulb.
While electricity passing through a medium is going to encounter resistance (and therefore heat) the heat from an LED is totally different. Without getting into the specifics, higher-powered LEDs simply put out A LOT of heat.
V-LEDs claims 3x 3W Rebels. I know a single 630nm (red) Rebel at 700mAh (its full power capacity) will put out anywhere between 60-105lm. While thats around 8-9 watts for a single die, the junction temp of that die on the board will be around 275*F. At full power, that single die requires a heatsink of approximately 25mm x 15mm.
Lets say we drop the wattage to 3, that would drop the lumen output to about 20-35lm, and maybe the junction temp of a single die to about 180*F. Now lets put three together. Thats 60-200lm (being liberal here), but the heatsink requirements are going to be enormous of 180*F from three dies being so close together. So I can only conclude that either that heatsink is WAYY to small (which will leave you with a dead LED in a matter of months), or V-LEDs is lying on that lumen output.
Answering your question about amperage draw, its just a matter of math. They claim 3x 3W LEDs, so that 9 watts, and the equation for amperage is I=P/V, so I = 9/12 which is 0.75 amperes. Compared to a 3157 bulb which is 27W means they draw about 2 amps, so they are still more efficient in terms of electricity being transformed into light, but whether or not that is hitting your reflector and has coverage is another equation. Even though it MAY have more lumens at the die, a general PnP LED will not have the candlepower of a stock incandescent bulb.
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From: In the fast lane from LA to Tokyo...
Not quite
While electricity passing through a medium is going to encounter resistance (and therefore heat) the heat from an LED is totally different. Without getting into the specifics, higher-powered LEDs simply put out A LOT of heat.
V-LEDs claims 3x 3W Rebels. I know a single 630nm (red) Rebel at 700mAh (its full power capacity) will put out anywhere between 60-105lm. While thats around 8-9 watts for a single die, the junction temp of that die on the board will be around 275*F. At full power, that single die requires a heatsink of approximately 25mm x 15mm.
Lets say we drop the wattage to 3, that would drop the lumen output to about 20-35lm, and maybe the junction temp of a single die to about 180*F. Now lets put three together. Thats 60-200lm (being liberal here), but the heatsink requirements are going to be enormous of 180*F from three dies being so close together. So I can only conclude that either that heatsink is WAYY to small (which will leave you with a dead LED in a matter of months), or V-LEDs is lying on that lumen output.
Answering your question about amperage draw, its just a matter of math. They claim 3x 3W LEDs, so that 9 watts, and the equation for amperage is I=P/V, so I = 9/12 which is 0.75 amperes. Compared to a 3157 bulb which is 27W means they draw about 2 amps, so they are still more efficient in terms of electricity being transformed into light, but whether or not that is hitting your reflector and has coverage is another equation. Even though it MAY have more lumens at the die, a general PnP LED will not have the candlepower of a stock incandescent bulb.
While electricity passing through a medium is going to encounter resistance (and therefore heat) the heat from an LED is totally different. Without getting into the specifics, higher-powered LEDs simply put out A LOT of heat.
V-LEDs claims 3x 3W Rebels. I know a single 630nm (red) Rebel at 700mAh (its full power capacity) will put out anywhere between 60-105lm. While thats around 8-9 watts for a single die, the junction temp of that die on the board will be around 275*F. At full power, that single die requires a heatsink of approximately 25mm x 15mm.
Lets say we drop the wattage to 3, that would drop the lumen output to about 20-35lm, and maybe the junction temp of a single die to about 180*F. Now lets put three together. Thats 60-200lm (being liberal here), but the heatsink requirements are going to be enormous of 180*F from three dies being so close together. So I can only conclude that either that heatsink is WAYY to small (which will leave you with a dead LED in a matter of months), or V-LEDs is lying on that lumen output.
Answering your question about amperage draw, its just a matter of math. They claim 3x 3W LEDs, so that 9 watts, and the equation for amperage is I=P/V, so I = 9/12 which is 0.75 amperes. Compared to a 3157 bulb which is 27W means they draw about 2 amps, so they are still more efficient in terms of electricity being transformed into light, but whether or not that is hitting your reflector and has coverage is another equation. Even though it MAY have more lumens at the die, a general PnP LED will not have the candlepower of a stock incandescent bulb.
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Joined: Jul 2007
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From: Maine
Let us know how you put the various components on the unit to fit and hold in the housings......I never saw such a cobbled up mess to put together for something this expensive. Thanks 88
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From: In the fast lane from LA to Tokyo...
At least VLEDs is making them PnP.....instead of trash+hack or scotch locks.....so I give them credit for that at least.....
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Joined: Jul 2006
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From: NJ
I like that these can be used as daytime running lights, then to dimming 50% when you turn your headlights on.
Do the older type SB's with all the little L.E.D's dim when headlights go on?
Do the older type SB's with all the little L.E.D's dim when headlights go on?
Last edited by tg150; Dec 23, 2012 at 04:46 PM.
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From: In the fast lane from LA to Tokyo...
IDK.....tg150 will find out for us.....
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From: In the fast lane from LA to Tokyo...
The bulbs will get rid of the amber "egg yolk" look during the daytime and when the truck is off but maintains the amber when on or signal is used......