7w bulb in new lamp

Ayr_Rage

@FFHillbilly nobody is disputing that however the overall design is to accommodate the heat and light output of a 4W LED bulb.

Using anything else, I believe the OP is using a CFL bulb, is against the manufacturer's recommendation.

FFHillbilly

Ayr_Rage said:

@FFHillbilly nobody is disputing that however the overall design is to accommodate the heat and light output of a 4W LED bulb.

Using anything else, I believe the OP is using a CFL bulb, is against the manufacturer's recommendation.

well the same theory applies to the heat and light output, it's just impossible to work to such tolerances.

manufacturers instructions don't always make sense. a lot of stuff comes from China and has been translated by somebody that has no understanding of the context

grumbler

FFHillbilly said:

it's not possible for a manufacturer to make a light fitting that will work with a 4W bulb but not be capable of working with a 7W bulb.
if you were to work out the minimum CSA of a cable capable of dealing with a whole 4W it's going to be about 0.0017mm² , that size of cable is impossible to manufacture.
a typical small conductor used in light fittings is going to be about 0.5mm² which in theory should be able to carry over 1Kw

Typically it's about the bulb heat dissipation, not the cable. Not that I'm saying that this is really the case for this lamp.

ThisIsWeird

This is a physically small bedside light.
It is clearly designed and intended for an LED bulb, and that is what should be used - even tho' the listing details doesn't appear to mention this, but only '4W SES'. That's poor.
A 4W LED will provide roughly what a 40W filament bulb would do, and such an output makes it a usable light. A 4W filament bulb - if it existed - would not.
A 40W filament bulb should not be used under any circumstances - far too hot, and a genuine hazard for this physically small light.  
The CFL will quite likely be 'fine' - you will 'get away' with it - but it will still emit more heat than its LED power equivalent, and provide less light output. If Slinky likes the effect, and he is confident it runs no more than luke-warm, he can make the judgement whether to carry on using it.
But the correct thing to do is to go 4W LED, and that's a no-brainer as they can be bought quite cheaply. 

And then there's the whole ball game of 'warm', 'cool', 'daylig....' I think 'warm' at, say, 3500k-ish? But it's a personal taste issue.

Ayr_Rage

Why did we ever go beyond this ?

grumbler

Because it's not Bible, makes little sense and was, most likely, written by some  idiot who, without thinking twice, recalculated ~40W incandescent to 4W LED.

Slinky

ThisIsWeird said:

The CFL will quite likely be 'fine' - you will 'get away' with it - but it will still emit more heat than its LED power equivalent, and provide less light output. If Slinky likes the effect, and he is confident it runs no more than luke-warm, he can make the judgement whether to carry on using it.

I've put my fingers on the bulb when it's on. It's warm, but not hot. It's absolutely nowhere near burning hot. Certainly not like the old incandescent days.

cerebus

Ayr_Rage said:

cerebus said:

Ayr_Rage said:

@cerebus a 40 W mini globe LED would be blinding !

I meant an old fashioned incandescent bulb!

Seeing as the lamp holder is designed for an LED bulb, using a compact fluorescent or incandescent bulb will produce more heat than expected.

Eh?

Please explain this 

cerebus

Ayr_Rage said:

@FFHillbilly nobody is disputing that however the overall design is to accommodate the heat and light output of a 4W LED bulb.

Using anything else, I believe the OP is using a CFL bulb, is against the manufacturer's recommendation.

Again how do you know this?

Are you the Chinese manufacturerer?

Are you dunelm who had to translate Chinese to English?

cerebus

Ayr_Rage said:

Why did we ever go beyond this ?

If the manufacturerers instructions told you to jump off a bridge when any rational person would question this, would you?

Manufacturers instructions are often wrong especially when things are shipped in from other countries and have to be translated.

You need to remember that translations are done by non technical people who have no idea what they are translating is right or not and translating something is not black and white, different translators will produce different translations.

Take the book les mis, multiple copies around with different translations depending on who translated it. (Fantastic read by the way)