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I want to buy LED bulbs to install in all the rooms and I don't know

  • What are the criteria to select the proper ones (for eye and physiologically good).

  • How to distribute them in every room ( I mean How many in every room and what's the distance between them)

I want the lighting most close to the sun light especially the sunset (Warm), because I want to feel the forest atmosphere, like this one:

enter image description here

I have read some numbers in K but I can't recognize the most suitable one: enter image description here

  • Usually they say on the label warm, white etc – Solar Mike Feb 12 at 12:58
  • It's going to take more than just new light bulbs to get that sort of atmosphere ... – brhans Feb 12 at 13:11
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    Buy some in different color temperatures and try them. Or buy some of the ones that can be varaiable color temperatures, and try those at their various settings. This is purely a matter of personal taste/opinion, there is no "most proper" - but your stated color preference would appear to be 3000K and below, at a guess. An exact number? We don't know your personal taste. Try some, see which ones you like. – Ecnerwal Feb 12 at 14:20
  • @Ecnerwal I want some factors to take care of when I buy, I know what I need but I don't know how to achieve the big picture, the atmosphere, the feeling, so I have asked for help to harmonize the position of light and the places plus the painting colors to give the feeling of Caramel or sunset. – Anyname Donotcare Feb 12 at 14:42
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    Most hardware stores have displays that demonstrate color. Also, you can correlate color with conventional filament bulbs, which are usually in the 3000K range. Really, this comes down to your preference and the conditions in your home (paint color, natural light sources, etc.). – isherwood Feb 12 at 15:01
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This is really an opinion question so I will just explain the color frequency and a listing to look for so you have the information to make your decision.

First the different lamps have color ratings 2500k through 6500k is the normal range the color at 2500 is a yellow orange many street lights using sodium vapor lamps are this color, very easy on the eyes but they do not make the area as “bright” as perceived with the same lumens at 6500k.

At the other end of the spectrum 6500k this is close to bright daylight and is perceived as much brighter than the lower 2500k light. Many industrial facilities & offices have moved to 5500k and above as it is closer to daylight. 6500k and above are used in many office buildings in the Pacific Northwest to reduce SAD sessional affective disorder (sometimes called cabin fever here) the wavelength and perceived brightness reduce the problems associated with lack of natural daylight.

The down side to 5500k and above is your brain now thinks it is not time for sleep so having a +5500k lamp in the bedroom is not the best choice but a home office, kitchen and living rooms the 5500+ may be a better choice. Keeping the 2500-3500k in areas of sleep and relaxation.

What I have in my home is the bedroom ceiling lights are 6500k and the bed side lamps are 3500k (2500k is just two yellow/oranges for me). When getting up in the AM the over head light is on , at night prior to bed the bed side lamps are on, this works really well and I would recommend it.

The last big advantage is power savings, most screw in bulbs today are based on the incandescent 60w Edison lamp , a standard 60w provides ~800 lumens, a cfl produces similar light using only 13 watts and a quality LED uses 6watts. There are some lamps that are more efficient and some that are less efficient but this can show that changing from all incandescent to led could cut your lighting cost to 10% of what it is or 1/2 if on cfl/ fluorescent. In my case the production areas appear much brighter at the same time.

The type of listing on your lamps I recommend is DLC (design light consortium) these normally have a 5 year warranty and UL and CE listings. I have had really poor experience with non DLC lamps, I find the electronic driver (power supply) in the lamp usually fails (I support a lumber mill that has thousands of lamps, tube style (t12, T8, T5) and flood lamps (400w to 1000w) I have replaced almost all the t 12 & T8 lamps with hybrid T8 lamps that can be direct wired ( they will work with a ballast but I want to eliminate the losses and failure possibility of a ballast). Most of the big power hungry floods were my first swap outs with a 240w-320w led flood replacing 1000w floods and the equipment operators love them. (I love them because I probably won’t have to change the bulbs and repair ballast for the next 5-10 years.

I hope this info helps you to make your decision.

Added, I just remembered there are some new tunable lamps, (the color spectrum can be adjusted) I have not tried any of these smart lamps yet but suspect they may be the next level in home automation and livability.

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  • high pressure sodium vapor lamps are much yellower than 2500k. Low pressure sodium is so yellow I think it goes over the yellow event horizon :) They certainly have a negative CRI, no joke there. They're used in communities near observatories because notching out that one yellow frequency is not that hard. – Harper - Reinstate Monica Feb 12 at 15:20
  • The sodium lamps I use are at 2064k I was trying to provide a real world example compared to standard lighting not that far off in the real world. Also the spectrum is wider but not many household lamps outside that range and that was what the question was about. – Ed Beal Feb 12 at 15:34
  • Thanks a lot for your great effort. I have three questions plz: -Can I summarize that I have to choose (2500k to 3500k) to get the forest atmosphere? -I'm a little confused about designlights.org/search there's tons of data Could U help me to select the proper item. -I'm in Egypt so I have to buy online, so before I asked the question I have searched on Amazon and find: amazon.com/… Is this good? – Anyname Donotcare Feb 13 at 8:43
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    Yes the lower range of 2500k will be like being in a Forrest closer to evening but before twilight. As the number gets larger it will be closer to noon. Beyond your range would more like being in the open at noon. Hope this helps. – Ed Beal Feb 13 at 14:14
  • Excuse me for asking a lot, I'm from Egypt so I have to buy online to get qualified products, mainly from Amazon, I don't know how to get the proper one from designlights.org/search I will be grateful If U recommend me some selections please. – Anyname Donotcare Feb 16 at 9:35
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The pictures you supplied as an example represent unnatural colors in a forest being highlighted by artificial lighting. What you ask for and then show seems to represent two different things.

Sometimes you have to buy a 3000k, 3500k, and 4100k bulb and see what works best for the location. Too low of color temperature and the whites in those pictures will fade, too high the whites will offend. The CRI (color rendering index) plays a difference too, if you have the option to pick a higher CRI the colors will be less distorted.

A little history, if go back to an era that electric lighting was just Edison bulbs people picked colors of walls, flooring and furniture that created a comfortable look with the available lighting. When fluorescent lighting became available the initial locations for use was in warehouses and other commercial settings where color was less important than efficiency and often the greys and browns in a industrial setting worked better with a lamp that was more blue (4100k) than an Edison bulb. When one of those blue cool white bulbs is used in an environment with colors picked for Edison bulbs too much blue becomes highlighted in the space, and a warmer (3000k) color was developed to more closely create a similar effect as 2700K Edison bulbs.

3500K is usually a pretty good neutral color, but we don't always decorate in the sames colors as 1950 so you have to look at your own interior colors. One house I lived in had kind of creamy tan carpets, matching paint, pine color cabinets and similar colored counter tops. The warm white lamps made it look dingy, 5000K lamps pulled the lighter tones out and made it more comfortable. House I live in now has all white baseboards, doors and casings. A 5000k lamp would make the the whites pop, and finger prints stand out. Also if somebody puts makeup on in a 5000k bathroom the goes to work in a 3000k office they may always look jaundice because they put too much yellow makeup on, or if they use a 3000k bulb for makeup and work outdoors they may look pale. You really need to light the room for it's use and colors.

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  • Could U help me to categorize the suitable bulbs for these categories: -bathroom -kitchen -office room -other rooms --- I want the other rooms to have the forest atmosphere near to Caramel color or sunset. – Anyname Donotcare Feb 13 at 8:56
  • I would expect 3500's would work good in the office, I would probably buy those bulbs and try them in other locations to see if the effect is too dingy or sterile. – NoSparksPlease Feb 13 at 16:17
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Any color you want, as long as it's not black

First, what you posted there about light color temperature is exactly correct. So there's your guidance; get the lowest color temperature you can. I also recommend the highest CRI, so it can enable our next trick.

2700K will be your lowest color temp, so to get lower still, we apply cinematic gels. Now, this video only talks about 2 colors of gel, but they make everything... any color you'd imagine, and 1/2 and 1/4 intensity versions of those blue/orange gels. You would want orange-looking gels to pull your color temperature even lower than 2700k.

Good CRI in the source lighting is important so the gels have the desired effect - if the balance of light frequencies is poor, the gel may not give you the color you expect!

You can also use adjustable LEDs such as the RGB Philips HUE. You'll get much better ultimate CRI with low-voltage LED strips which (instead of RGB) have cool white, warm white, and amber, but these are tougher to implement, of course.

Don't expect it to be super obvious

Color temperatures are only apparent when different light sources are right next to each other. The rest of the time, your eye automatically "white balances" to whatever the local light is.

This is normal; it's not a thing that needs fixing. But this is "lighting 101" and you had better bring that knowledge with you into this project.

Where do you get that knowledge expediently? Were this 1990, I woulds say volunteering for community theater or public access TV. This is designed by the Lighting Director and implemented by the Gaffer. In 2020, you will find plenty of Youtube videos either by actual Lighting Directors and Gaffers, and videos by people who make Youtube videos teaching how to make and light Youtube videos.

Applying this knowledge to the home is straightforward.

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  • Thanks a lot for your help. I concluded from your answer that I have to select (2700k)? Could I ask what's the range of the highest CRI, I mean when I can confirm that this bulb have Highest CRI. lastly : Are These items will achieve What I need forest atmosphere based on your recommendations: amazon.com/… --- – Anyname Donotcare Feb 13 at 8:52
  • @AnynameDonotcare Ah yes, IkeaGuy... A Chinese junk seller who names all the "companies" and products to sound like IKEA. First, it's Chinese rubbish, so don't put it on mains unless you like house fires. Use only things with a UL, CSA or ETL listing. (CE isn't one). Second, they either don't state CRI or they lie. Perfect CRI is 100; 80 is acceptable, 90 is good. – Harper - Reinstate Monica Feb 13 at 9:46
  • That Philips bulb is quality. It is 2700k, but intentionally changes color toward 2200k when you dim it. It will not provide 2200k at full brightness. I don't know what "forest atmosphere" is. I recommend you choose the color temp you want, buy bulbs of whatever color temp you can get, and use gels to adjust further. – Harper - Reinstate Monica Feb 13 at 9:57
  • Do U mean by IKEA YEELIGHT the second link ? – Anyname Donotcare Feb 13 at 11:59
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3000k or 3500k is the most popular that we sell for living areas in homes and 4100k is the most common in office settings while 5000k or 6500k is the most common in warehouse or workshop areas.

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