Small CFL

[pig89]

Hi,
Looking to buy a very low CFL to go in a brick light, ideally emitting around 10 watts to match other lighting in the area. What is the smallest equivalent CFL available?

Many thanks.

 

[PrenticeBoyofDerry]

They normally start at around 11W

 

[Taylortwocities]

Lower, you can get 5watt CFLs

http://www.amazon.co.uk/Pack-MiniSun-Energy-Saving-Daylight/dp/B008FM0N6Q

 

[RF Lighting]

Use LEDs. They're smaller, brighter, work in the cold and last ages

 

[Taylortwocities]

Use LEDs. They're smaller, brighter, work in the cold and last ages

I got the impression he doesn't want "brighter"

 

[Taylortwocities]

Use LEDs. They're smaller, brighter, work in the cold and last ages

I got the impression he doesn't want "brighter"

PIG, quoting light output in watts is pointless. The wattage refers to the power consumed, not the light output. A tungsten lamp consuming 10watts will be very dim indeed, but a 10watt LED wil be as bright as a 50watt halogen.

For this reason, light output is now quoted in lumens. That's gives a better comparison.

 

[pig89]

Sorry I mean around 600 lumens, just found a suitable one now.

Many thanks for all replies.

 

[ericmark]

Use LEDs. They're smaller, brighter, work in the cold and last ages

I got the impression he doesn't want "brighter"

PIG, quoting light output in watts is pointless. The wattage refers to the power consumed, not the light output. A tungsten lamp consuming 10watts will be very dim indeed, but a 10watt LED wil be as bright as a 50watt halogen.

For this reason, light output is now quoted in lumens. That's gives a better comparison.

That's theroy in practice it does not work. My living room had 3500 lumen with CFL and 2800 lumen with LED and the LED is much brighter.

When I looked into this it would seem there are many different standards on how to measure lumen. Some measure on switch on other after one hour some measure each light emitting unit and just add and some measure output as a whole. Also it would seem the standard was to reflect on how much man can see in the spectrum but seems they got it wrong again dad.

I got 6W CFL from Ikea but seems no built in fuse so when it failed it welded its self to holder the B16 MCB clearly to big for a 2A rated B22d bulb holder.

I really can't see how it's that hard to measure light output. My camera does it very well but the lumen meters clearly are giving some odd results.

 

[JohnW2]

For this reason, light output is now quoted in lumens. That's gives a better comparison.

That's theroy in practice it does not work. My living room had 3500 lumen with CFL and 2800 lumen with LED and the LED is much brighter. ... I really can't see how it's that hard to measure light output. My camera does it very well but the lumen meters clearly are giving some odd results.

I think one of the main problems is probably that, since there are so many different arrangements of lighting installations, it's impossible to have a 'one-size-fits-all' way of expressing the light output of lamps which will correspond to human perceptions of 'brightness' in the lighting situation concerned.

One problem with 'luminous flux' (measured in lumens) is that it is (or should be) a measure of the total light output of a lamp, regardless of how that light is distributed, and what it is illuminating. Hence, if one has two lamps with the same luminous flux (lumens) illuminating identical surfaces, then if one has a narrower beam angle than the other, the 'illuminance' of that surface (lumens per m², aka lux) will usually be greater than with the lamp which has a wider beam angle - hence, in some situations, the human perception will probably be that one of those lamps is much 'brighter' (since perception will probably be largely dependent on the illuminance of the surface), despite them both having the same luminous flux (lumens).

As I've said, I think the difficulty is that there are so many different ways in which lighting can be used/arranged that there is no way in which light output of lamps could be expressed in a manner that would allow easy comparisons of the 'perceived brightness' that would result from use of those lamps in all situations. In some situations, lumens may be a reasonable indicator, whereas in other situations, lux at a specified distance may be better. At the very least, if (as per eric's comments above) people attempt to make comparisons of the the apparent 'brightness' of different lamps (in relation to stated 'lumens'), I think that they should at least make sure they are comparing lamps which have similar beam angles, otherwise it really is a 'chalk and cheese' comparison.

Kind Regards, John