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19/10/2019 at 12:05am
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Hi, nearly all suppliers quote the watts. The Quest kits are 14.4 watts and Google says 900 lumens is 15 watts.
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Allan
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21/10/2019 at 8:59pm
Location: West country
Outfit: Mondeo
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Be careful converting watts to lumens. Watts are the power going into the lamp and lumens is the amount of light coming out, so it depends entirely on the efficiency of the lamp as to how many the lamp produces and then if the light has any form of glare control (such as a light shade) it will further reduce the light being emitted.
Then it depends on the light distribution of the light fitting as to how much light ends up where you want it. e.g. some lights will shine up onto the ceiling and rely on light being reflected back to your desk.
Again be very careful with LEDs. Good lighting requires light on the working plane. That's the area you are looking at like the page of your book or the surface of your desk you are working on. Good lighting requires an illumination of around 200 lux for non critical work going up to 500 lux for critical work for a long period. Someone with impaired sight may required even more.
Lux it the number of lumens per square metre actually reaching your working plane.
Glare is a major problem with LEDs. If you look directly at a light the iris in your eye will close to restrict the amount of light entering your eye. Think how much you can see when looking at a car head light. By day, there is lots of light from daylight so you can see even when looking at a head light but at night all you see is the headlight.
So you need a light which can direct light onto your working plane but will not direct bright light into your eyes.
I'm not sure how much your husband can realistically see but something like this will give lots of light for not too much money.
These would need mains electric with a flex attached and some means of fixing them to the tent roof.
https://www.screwfix.com/c/electrical-lighting/battens/cat3640003
You may find simple fluorescent cheaper than LED. Your not interested in low power consumption just for camping.
Of course they may be tricky to transport.
If you do go for fluorescent I would suggest you use T8 lamps rather than T5. T8 are 1 inch diameter and T5 5/8ths of an inch.
T5 tend to need to warm up before giving full light and don't light up very well at low temperatures. T8 will be much better.
Post last edited on 21/10/2019 21:04:25
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22/10/2019 at 9:25pm
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Thanks Jane, so he doesnt need it to be particularly bright.
Commercial lamps and light fittings quote technical data like lumen output, colour rendering, colour temperature, photometric data etc all of which we use to select the correct fittings and quantities and positions etc.
As the Lumi-link tube lights are aimed at the general public very few would know what it was so I'm not surprised companies selling it dont know what it is.
60 lumens per watt is a reasonable output for LEDs.
However, as it is a tube, the light will come out in all directions so not much will shine onto his book. Also, if the light strip is 5m long, the 900 lumens will be distributed along that length.
I think you need more of a point source light so it will all be behind him shining on his book. In our caravan there are two LED downlights at the front which shine down as reading lights. They are quite good.
Something like this might do:
https://www.downlights.co.uk/bathroom-led-spotlights-ip44-forum-milan.html
Perhaps you could fix it to a small piece of wood with hooks to the tent frame and may be better to have two spaced out so its not so shadowy.
Obviously you would still need general lighting in the tent which may be the light tube type.
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Topic: LED LIGHT STRIPS
via mobile 19/10/2019 at 9:39am
