At 01:40 PM 6/07/05 +1000, you wrote:
>On Wed, 06 Jul 2005 11:09:19 +1000, you wrote:
>
>> At 09:12 AM 6/07/05 +0930, you wrote:
>>>Hi Peter
>>>
>>>I can get these flashlights through a friend of mine.
>>>He is even making one available for trails.
>>>I will find out how much they cost and will get back to you.
>>>If you like, you can be the guinea pig and pay me when you
>>>are happy.
>>>
>>>The flashlight draws under 20 watt.
>>>
>>>Bernard Eckey
>>
>>
>> Umm , how much under 20 watta? 20 watts at 12 volts is about 1.7 amps! If
>> it is anything like that continuous then you'd better have a BIG battery.
>>
>I suspect that it draws 20W while the light is on, and something much
>less when it is off, so assuming two short pulses of 100 mS each,
>repeated each second could give a duty cycle of about 0.2, and thus an
>averge load of 20 x 0.2 = 4W, or 333 mA. Still quite high, but a
>fairly new 7.2 AH battery should last about 7.2/0.333 + 21 hours (with
>no other load, of course)
>Cheers, John G.
A 20 watt light is hardly stunning, particularly against a glare background
on a bright sunny day when the recipient is wearing dark glasses.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
Int'l + 61 429 355784
email: [EMAIL PROTECTED]
website: www.borgeltinstruments.com
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