[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

Conference 7.286::home_work

Title:Home_work
Notice:Check Directory (6.3) before writing a new note
Moderator:CSLALL::NASEAM::READIO
Created:Tue Nov 05 1991
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2100
Total number of notes:78741

1020.0. "Tools - Flashlights" by KAOFS::M_COTE (Free speech costs) Wed Jun 17 1992 11:06

    
    
    I'm replacing a 3 cell MAG-LITE bulb. I have been using rechargeable
    nickel batteries for years now, using the flashlight nightly as part
    of my dog walking routine.
    
    	The bulb I picked up last night was krypton gas filled. This  bulb
    made by/for MAG-Lite was an expensive bulb.While walking away with
    my new purchase I noticed that the instructions suggested the bulb
    only be used with alkaline batteries. It actually stated NOT to use
    with rechargeables. When I went to return, the manager gave me her
    verbal guarantee that if the bulb failed she would refund my funds.
    
    	My question is, why would the krypton bulb not like rechargeables?
    I have read in this notesfiles somewhere that some inert gas bulbs must 
    burn at a certain temp else oxides collect on the filiment.
    Could this be the case here?  Are my batteries in peril?
    
    Thanks 
    mike
T.RTitleUserPersonal
Name
DateLines
1020.1Oh ohSTAR::DIPIRROWed Jun 17 1992 12:062
    	If your batteries are in peril, don't expect Superman to come to
    your rescue with all that Krypton around your house.
1020.2Not enough voltage from rechargablesPATE::MACNEALruck `n' rollWed Jun 17 1992 12:207
    I saw this same notice on a Nintendo accessory that used C batteries. 
    I called their 800 number to ask why.  I was told that the voltage of
    alkaline C batteries is higher than the voltage of rechargable C
    batteries.  The difference could effect the performance of the
    accessory.  Sure enough, when I compared the voltage numbers printed on
    the batteries, the voltage for the rechargables was .25 volts less than
    the alkalines.
1020.3MRKTNG::BROCKSon of a BeechWed Jun 17 1992 13:502
    I think a typical rechargeable  - AA, C, D  etc, will be rated at 1.2v.
    An alkalyne will typicall be rated at 1.5v.
1020.4I have no problems with nicadsCLO::POLITZERI'm the NRA!!Wed Jun 17 1992 15:029
    A lower voltage source will typically not have the bulb burn as bright. 
    I don't know if this results in any other complications.
    
    In the past I have heard (unsubstantiated) that the lower operating
    temperature actually extends bulb life.
    
    I have several different size maglites with krypton filled bulbs.  I
    have been using rechargables in them for 4-5 years with no noticable
    effects.  I have had to replace only 1 bulb in this time.
1020.5Wont be as bright...JUNCO::CASSIDYAspiring conservationistThu Jun 18 1992 01:5415
>    	My question is, why would the krypton bulb not like rechargeables?
>    I have read in this notesfiles somewhere that some inert gas bulbs must 
>    burn at a certain temp else oxides collect on the filiment.
>    Could this be the case here?  Are my batteries in peril?
  
	    I kinda doubt that oxide theory.  You need oxygen to form 
	an oxide and there just ain't no oxygen in a vacuated lamp.  I
	suspect that it's a matter of brightness, or lack there of.
	Alkaline cells would put out more power and for a longer duration
	than rechargables.
	    For any nit pickers who want to bring up the fact that
	there ain't no such thing as a perfect vacuum, the O2 content
	would be so small as to be insignificant.
	
					Tim
1020.6RAMBLR::MORONEYIs the electric chair UL approved?Thu Jun 18 1992 13:189
If it is not a halogen bulb it will last longer and will produce less light
and be more yellowish with a lower voltage.  If it is halogen, I've heard
debate to whether it will last longer or shorter due to how they work.

Krypton is an inert gas which fills the bulb (it is not a vacuum), and will not
react with anything except under extreme conditions not found in a bulb.  So
there is no chance any "oxides" of any sort forming.

-Mike