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'How can the light that burned so brightly'
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whitelegg1



Joined: 05 Apr 2005
Posts: 409
Location: Woodford Green
PostPosted: Sat Dec 31, 05 10:30 am    Post subject: 'How can the light that burned so brightly'  Reply with quote    

I have an electrolumenesence question......

I have recently purchased a head torch with separate battery pack.

The bulb (a halogen 5w 6v G4)

Now here's the question, I would like to get a bit more light out of it....if I had a 20w 12v G4 halogen bulb, would this give work like a 10w 6v???? Or (more likely) will it not work at all!

Can you guess what I want it for???? (Clue in the Subject)

sally_in_wales
Downsizer Moderator


Joined: 06 Mar 2005
Posts: 20809
Location: sunny wales
PostPosted: Sat Dec 31, 05 10:44 am    Post subject: Re: 'How can the light that burned so brightly' Reply with quote    

whitelegg1 wrote:


Can you guess what I want it for???? (Clue in the Subject)


Err, you want to stare at it until your previously 'bright eyes' start to see nothing but green splodges?? Be careful, you'll trip over all the bunnies if you do that

Treacodactyl
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Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Sat Dec 31, 05 11:54 am    Post subject: Reply with quote    

What do the instructions say? Drawing more current out of the battery may cause the wires to overheat and using a 20W bulb where only a 5W bulb should be would give off more heat and could melt the thing. The battery would also last for far less time.

whitelegg1



Joined: 05 Apr 2005
Posts: 409
Location: Woodford Green
PostPosted: Sat Dec 31, 05 2:10 pm    Post subject: Reply with quote    

Instructions are vague to say the least.

However, I got it from Maplin's, and it is exactly the same as one by Tracer (a reputable maker of gun lights and head lamps.)

I'm sure the do a 12v version.

I was thinking that it would only put out 20w if I ran it at 12v.
So if I run it at 6v would it put out 10w?
Still a good increase on 5w, but not into car headlamp territory!!
Obviously I'm expecting battery life to be halved. But that could be acceptable for the extra light.
Plus if that set up works, I will probably go for a lead acid battery, rather than the 4d cells.
Of course I could go for a 12v battery, but then weight weight weight. I need to be able to carry what I find!

Silas



Joined: 29 Oct 2004
Posts: 6848
Location: Staffordshire
PostPosted: Sat Dec 31, 05 4:21 pm    Post subject: Reply with quote    

[quote="Treacodactyl"]What do the instructions say? Drawing more current out of the battery may cause the wires to overheat and using a 20W bulb where only a 5W bulb should be would give off more heat and could melt the thing. The battery would also last for far less time.[/quote]

Should be OK if he shaves his head first and places a damp sponge under his cap before switching on.

Penny Outskirts



Joined: 18 Sep 2005
Posts: 23385
Location: Planet, not on the....
PostPosted: Sat Dec 31, 05 4:26 pm    Post subject: Reply with quote    

I've got that damn song in my head now

Blacksmith



Joined: 25 Jan 2005
Posts: 5025
Location: Berkshire
PostPosted: Sat Dec 31, 05 5:40 pm    Post subject: Reply with quote    

V=IR

Treacodactyl
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Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Sat Dec 31, 05 5:58 pm    Post subject: Reply with quote    

...and our old friend Ivy Watts, IxV=W. But the bulb should say what the W and V requiremnts are and I would expect the torch head only to be able to cope with a certain amount of heat from the bulb.

Have you tried asking Maplins?

whitelegg1



Joined: 05 Apr 2005
Posts: 409
Location: Woodford Green
PostPosted: Sat Dec 31, 05 6:51 pm    Post subject: Reply with quote    

No I haven't, I think the model I purchased is underbulbed (a word you don't hear every day!)

The same design is also sold with a 12 v system and a higher wattage bulb, can't see why they would produce two different models that looked the same, but used completely diffent parts.

So I'm thinking I have the Mk1 Escort 1100, and am turning it into a Bubble arched RS1600

pricey



Joined: 28 Feb 2005
Posts: 6378

PostPosted: Sat Dec 31, 05 7:33 pm    Post subject: Reply with quote    

Penny wrote:
I've got that damn song in my head now


We can all sing it next week

Treacodactyl
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Sat Dec 31, 05 7:43 pm    Post subject: Reply with quote    

pricey wrote:
Penny wrote:
I've got that damn song in my head now


We can all sing it next week


I was expecting Chas n Dave's Rabbit, Rabbit.....

whitelegg1



Joined: 05 Apr 2005
Posts: 409
Location: Woodford Green
PostPosted: Sun Jan 01, 06 12:20 am    Post subject: Reply with quote    

Bunderwall


sparky



Joined: 02 Nov 2005
Posts: 199

PostPosted: Sun Jan 01, 06 12:27 am    Post subject: Reply with quote    

if you put a brighter bulb in it it may melt the reflective backing

also make shor it is a halogin not a cripton bulb

ps no superman jokes

Simon S



Joined: 13 Jan 2005
Posts: 38
Location: Mid Beds
PostPosted: Tue Jan 03, 06 2:29 pm    Post subject: Reply with quote    

IIRC Power = V2/R, therefore for a given resistance if you halve the voltage you get a quarter the power or in this case you are back to 5W, though this doesnt take into account the internal resistance of the battery.

Simon

2blackcat



Joined: 31 Aug 2005
Posts: 42

PostPosted: Tue Jan 03, 06 4:22 pm    Post subject: Reply with quote    

There's supposed to be a site called candlepower.forums which could answer all your questions ...... but I can't access it from this computer (work one)

So, all in all, not a lot of help

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