LED Desk Lamps

[BVH]

I've found only one source on the web for turnkey made LED desk lamps. Does anyone know some sources for turnkeys or if not, a source for bulbs. The bulb i'm talking about is a standard size screw-in base, about 1 1/4" in diameter and about 4" long (excluding base) and usually come in 40 and 60 watt versions. Its a long and skinny bulb typically found in those small, green glass shaded brass lamps.

 

[gessner17]

Check out http://www.ccrane.com

 

[PhotonBoy]

LED Desk Lamp - RS Canada

 

[BVH]

Thank you guys! Some good prospects!

PhotonBoy, do you have this lamp and if so, how do you like it? Are the led's very white or more blue shaded?

 

[PhotonBoy]

Sorry, don't have the light, can't comment on the LED tint or brightness.

 

[lahjik]

Another possiblity from Levengers - a toy store for readers and writers.
Infinity LED Desk Lamp

 

[Lynx_Arc]

about how much equivalent light (compared to incandescent) are you looking for from an LED desklamp?

 

[BVH]

My current lamp is a 40 watt incan. but I really don't expect to get the equivilent lumens in an LED desk lamp from what I've seen. No one is giving any type of measurement except the current draw in watts.

 

[Lynx_Arc]

I don't have all the specs memorized but if you are trying to get even close to half that amount of light output you are going to have to go with high output luxeons or a rather large array of 5mm LEDs.... perhaps in the range of 100 or more. I would guess about 5 lux3 LEDs would be a start, part of which depends on what area you need to cover in light. The larger the area the more LEDs you will need to maintain intensity over the entire area.

What you need to look at is lumens output and start there.
A 40 watt bulb has I think about 450 lumens to start with, some of which is reflected,scattered elsewhere so I would guess about 2-300 lumens probably falls on the desk somewhere you can use it. Compare that to about 1-3 lumens for 5mm LEDs and about 15-25 lumens/watt on the luxeons and you can get the idea.

 

[MikeLip]

Not LED (sorry) but I simply put one of those corkscrew flourescent replacement lamps in my desk lamp - nicer light, and a lot cooler. Plus it draws only 15 watts for a 60 watt equivalent output, and it has a hugely improved life span. Cheap, too! /ubbthreads/images/graemlins/grin.gif

 

[Lynx_Arc]

It is hard to beat valuewise flourescent lights for indoor reading if you do not mind the color. LED lamps approaching the output of a simple 15 watt flourescent light would cost a bunch more and probably not put out near a uniform a flood pattern, while LED based lights have to have heatsinking, fancier regulators/circuits, optics/reflectors etc and multiple high power LEDs required to add up to the light output of a $5-10 tube do not even approach that price.

 

[ACMarina]

An LED desk lamp, would it draw less power than an incandescent?? I'm gonna get one sooner or later just so I can say I've got one, but it would be nice if it secretly saved on electricity. .

 

[BVH]

I like fluorescents also but there is nothing like the white color of a good white LED to really bring out the contrast between white pages and black print. Any color flouresecent bulb has not been able to match it. The example I use is from an L4, which I know is premium. I am hoping the desk lamp I ordered with 20 LEDs will be at least somewhat similar. It uses less than 3 watts.

 

[gadget_lover]

[ QUOTE ]
Lynx_Arc said:
I don't have all the specs memorized but if you are trying to get even close to half that amount of light output you are going to have to go with high output luxeons or a rather large array of 5mm LEDs.... perhaps in the range of 100 or more. I would guess about 5 lux3 LEDs would be a start, part of which depends on what area you need to cover in light. The larger the area the more LEDs you will need to maintain intensity over the entire area.

What you need to look at is lumens output and start there.
A 40 watt bulb has I think about 450 lumens to start with, some of which is reflected,scattered elsewhere so I would guess about 2-300 lumens probably falls on the desk somewhere you can use it. Compare that to about 1-3 lumens for 5mm LEDs and about 15-25 lumens/watt on the luxeons and you can get the idea.

[/ QUOTE ]


I beg to differ. If you start with Lumens you are including all the light that never reaches the desk. On the other hand, if you start with measuring the light that falls on the desk (lux or cp) you will find that a single 1 watt LED may well match it. I have a 1 watt LED task light that produces as much light at 16 inches as a 250 watt halogen that's 4 foot above my work bench.


Daniel

 

[Tentou]

Quantum is going to be putting some desk lamps out, but they're not going to be able to match a good incandescent light unless they use several Luxies and a good quality diffuser. Having too little light is a good way to get eyestrain.

 

[cobb]

My desk lamp is a 200 watt cf light sof america light. My chest light is my cabelas 5 watt one or my v2 6 chip. If I am reading a college book or bill or loooking at something I use the 200 watt light. For like the job listings in the newspaper, catalogs I use an led flashlight laying on my chest.

 

[steve_vance]

[ QUOTE ]
BVH said:
I've found only one source on the web for turnkey made LED desk lamps. Does anyone know some sources for turnkeys or if not, a source for bulbs. The bulb i'm talking about is a standard size screw-in base, about 1 1/4" in diameter and about 4" long (excluding base) and usually come in 40 and 60 watt versions. Its a long and skinny bulb typically found in those small, green glass shaded brass lamps.

[/ QUOTE ]

Check out this thread CPF