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Most HID lights around were developed to run the D2S lamp which is a 35 watt unit manufactured by both Phillips and Osram. This unit is designed to run at extreme temperatures as it was created specifically for the automotive industry, the operating range is something like -40c-+ 60c as these are the types of temperature normally associated with automotive products. I don't have the exact spec in front of me but I'm sure it is easily available. The reason why the unit will not strike in low temperatures is probably due to battery capacity, at low temperatures batteries can drop to only a fraction of their normal operating voltage which may not be sufficiant to operate the ballast unit and so cannot create the massive current surge needed to strike an HID D2S lamp. As the temperature was only in the freezing region the batteries are apparently not of sufficient capacity for the design requirements of the ballast unit in the torch. There are therefore two possible problems; 1) The batteries are either inadequate or toward the end of their life, get their charge capability checked out. 2) The ballast unit is not operating properly. An important note for anyone looking at HID lighting. ONLY buy a unit with the D2S lamp,it is transprt rated and therefore is shock proofed, other units are commercial lighting lamps and have no shock proof capability, drop it and it can cost you $100 for a new lamp. Cheers. So, your gripe is not really with HID technology but ----- Original Message ----- From: Brian Nadwidny <nadwidny@ho*.co*> To: <techdiver@aquanaut.com> Sent: Monday, March 27, 2000 7:17 PM Subject: HID lights in the cold > A buddy of mine was doing an ice dive recently and took out his new HID > lights. However he couldn't get them to fire up. Is too cold of a > temperature a known problem with HID lights or is there a possible problem > with his lights? Air temps were around -10C and water temps around 2 or 3C. > > Thanks in advance > > Brian > Edmonton, Alberta, Canada > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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