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flylists(at)dbarrett.net
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 Posted: Thu Dec 17, 2009 2:57 pm Post subject: HID bulb types |
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I'm piecing together an HID landing light system and need to decide between
D1S and D2S bulbs. D1S has the igniter in the bulb, and D2S has it in the
ballast. Is there any advantage in eliminating the relatively short
high-voltage run between the ballast and bulb by using the D1S type? The
bulb and ballast will be in the wingtip along with a VOR antenna. Will the
bulb type make a difference if I decide to install a wig-wag flasher?
David Barrett
RV-7 Wings
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XeVision
Joined: 07 Oct 2009
Posts: 26
Location: Ogden, Utah
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| Posted: Thu Dec 17, 2009 4:22 pm Post subject: Re: HID bulb types |
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| flylists(at)dbarrett.net wrote: | I'm piecing together an HID landing light system and need to decide between
D1S and D2S bulbs. D1S has the igniter in the bulb, and D2S has it in the
ballast. Is there any advantage in eliminating the relatively short
high-voltage run between the ballast and bulb by using the D1S type? The
bulb and ballast will be in the wingtip along with a VOR antenna. Will the
bulb type make a difference if I decide to install a wig-wag flasher?
David Barrett
RV-7 Wings |
The noise difference between D1S and D2S is significant, especially if pulsing because of the noisy on pulses. D1S is what you definitely want with the high voltage igniter at the bulb, not in the ballast.
If you use D2S anyway, at least make sure the HV cable to the bulb and the socket are BOTH shielded. Most modern Automotive OEM ballasts are made this way. Please don't use the cheap Asian made stuff if you are concerned about noise. Pick up a used ballast at a junk yard.
The bulb types will not matter for wig-wag. D2S or D1S are both ok for that as long as you warm the bulbs up (steady on) for 20 seconds minimum and 30 seconds is even better, before you start wigwag. Make sure you are pulsing at about 1Hz (no more than 1/2 second off on each channel and at least 1/2 second on for each pulse). This is for good bulb life.
Many HID ballasts will have a short life if you wig-wag. Most of them (automotive) were not designed for this punishment. The SAE design specs for Automotive ballasts are only ~20,000 starts.
That is one of many reasons why XeVision designs and makes our own ballasts. Designed from the start (ground up) for Wig-wag capability. Also, on our newest ballast systems, it is not required to interrupt main power to the ballast for the wig-wag function. Our new XePulse II provides a very small trigger signal to the ballast for on/off wig-wag function. This extra 3rd wire only needs to be 20 or 22 awg for mechanical strength. Our newer ballasts use a 3 wire input connector, 2 wires for + and - and the 3rd for the on/off wig-wag trigger. This is a much better way to control wig-wag in HID systems. The XePulse II only weighs about an ounce and can trigger about 250 ballasts per channel (obviously way overkill). It is only about 1.5 X 1.5 X .75 inches and uses a 9 pin d-sub connection.
All of this new proprietary ballast and HID wig-wag technology makes for a very quiet (EMI / RFI) system. This wig-wag system IS patented as of Nov 10, 2009
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_________________
LED still has a long way to go to compete with HID as a landing light. This is true in terms of total lumens and reach (distance). |
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