Bulb Question

[Mayhem 1]

Greetings and a very good Sunday Morning to all,

I would like to ask anyone who is technical minded a question regarding bulbs.

My main two moonflower effects I use for kids parties take this sort of bulb

http://img.photobucket.com/albums/v497/Carpmonster/EFP.jpg

Now, the ones I have been using are Osram XENOPHOT 64627 HLX EFP
(100w 12v) with no probs.

I had to replace 2 yesterday but could only get Soundlab projector lamp (100w 12v)

They work ok but they seem really dim compared to the others.

Can anyone please tell me if there is any difference between these lamps in any way and how come one is much brighter than the other? even though they are both 100w 12v??

[Dragonfly]

Greetings and a very good Sunday Morning to all,

I would like to ask anyone who is technical minded a question regarding bulbs.

My main two moonflower effects I use for kids parties take this sort of bulb

http://img.photobucket.com/albums/v497/Carpmonster/EFP.jpg

Hi Mayhem surely thats a statement not a question??? :D :D

[Mayhem 1]

Hiya Buddy,

Maybe it is mate, but I can not work it out?

As I said buddy even though they are the same = 100w 12v how come one is brighter?

[OllieJames]

Mayhem,

I had this exact problem! I'm not sure why though!

[Vectis]

12V 100W is its consumption, not its light output.

Light output is measured in lumens.

Based on your findings, the Soundlab lamps are less efficient. Simple as.
They were probably also cheaper? ;)

[Mayhem 1]

Cheers Guys,

I must admit I had thought that the Soundlab ones were going to be not as good but I was in a rush.

It is amazing that 2 bulbs can be so different in brightness even though they are for all intense and purposes the same looking bulb.

[Corabar Steve]

12V 100W is its consumption, not its light output.

Light output is measured in lumens.

Based on your findings, the Soundlab lamps are less efficient. Simple as.
They were probably also cheaper? ;)

You couldn't have brought that up a week ago?? :sj:

[Vectis]

You couldn't have brought that up a week ago?? :sj:

Why, you bought some? :o

[Corabar Steve]

Nope but I know somebody who really ought to know this information.

[Vectis]

Ah yes! Me too! :p :D :devil:

[Penfold42]

Number 3 top position - May 1958. :p :D

[nigelwright7557]

They work ok but they seem really dim compared to the others.

Can anyone please tell me if there is any difference between these lamps in any way and how come one is much brighter than the other? even though they are both 100w 12v??

A bulb uses energy and not only puts out light but also heat too and this will always sum to 100watts in a 100watt bulb.

I suspect the new bulbs are generating more heat and less light.

There are different types of element and some are much brighter.
Is one halogen and the other something else ?

[Tom]

Would it be a different gas inside the lamp???

I think someone should create a lamp for lights that is filled with xenon gas instead of halogen gas.

These are not HID lights (like in cars) but xenon gas burns brighter so would makes all lights look brighter overall.

[Ajaysdisco]

The difference is in the manufacturing process.
Normally manufactures do a standard and a long life version of a lamp.
There is no such thing as a free lunch; if a bulb is made to last longer there will be a trade off in brightness.

So if you get a long life bulb is will be slightly darker than a standard bulb.

The other possibility is, as someone else has mentioned, the efficacy of the lamp. (How efficient it is).

[rob1963]

if a bulb is made to last longer there will be a trade off in brightness.

A bit like energy saving bulbs, then.

:sofa:

[Mayhem 1]

Gentlemen:

Many thanks for the answers to my question I have since found out after having a chat with an owner of a lighting shop.

He said that the two lamps even though they are both 100w and 12v are different simply because of the make!!! simple as that.

I replaced with two of the Osram ones I had before and it is a 100 times better!!!!!

Many thanks again,

Have a good day.

[Corabar Steve]

A bulb uses energy and not only puts out light but also heat too and this will always sum to 100watts in a 100watt bulb.

Is heat measured in watts too then?