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office lighting recommendation

Discussion in 'Lighting' started by Jeff Kish, Aug 18, 2004.

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  1. Jeff Kish

    Jeff Kish Guest


    I'm in an office with standard Flourescents.
    I'd like to find some bulbs (reasonably priced) that will me more natural/less
    visually straining on my eyes as I stare at a computer all day.

    Can someone make a recommendation?

    Jeff Kish
  2. What type of "standard" fluorescent lamps? T12 or T8? I assume 4-foot.
    If T12 are they 40-watt or 34-watt?
  3. You should try full spectrum or color correct lamps these are as close to
    natural sunlight as you can get. They are available in T8 or T12 in every
    length imaginable. They reduce glare and eye strain and can be used in any
    fixture. I hope this helps.
    BA Russell


    I'm in an office with standard Flourescents.
    I'd like to find some bulbs (reasonably priced) that will me more
    visually straining on my eyes as I stare at a computer all day.

    Can someone make a recommendation?

    Jeff Kish
  4. Jeff Kish

    Jeff Kish Guest

    Thanks, but work just pays for a standard Dell monitor.
    what else?
    Jeff Kish
  5. Jeff Kish

    Jeff Kish Guest

    They look like 4 foot bulbs.
    I can read "34 Watt" off the bulb through the grill.
    oh. p.s. I have contacts.. "really incredibly bad eyes".
    Jeff Kish
  6. OK, it sounds like you have 4-foot 34-watt T12 lamps, though they are
    also called 40-watt ES lamps, and if you feel the color is poor they
    are probably Cool White but it would be good to check.

    Cool White lamps have a color rendition index (CRI) of about 60, which
    is rather poor. You must replace the lamp with one of the same size
    and power rating, but you will probably be happy with any of the
    higher color quality versions such as the GE "SP" or "SPX" lamps, the
    Osram Sylvania "Designer" or "Designer Plus" series or the Philips
    "SPEC" series. The approximate CRI of each line is listed below.

    GE SP CRI = 70
    GE SPX CRI = 82
    Osram Sylvania Designer CRI = 70
    Osram Sylvania Designer Plus CRI = 80
    Philips SPEC CRI = 73

    Also, the lamps are available in color temperatures of 3000K and
    3500K, and sometimes 4100K. These are usually designated by the first
    two digits: 30, 35 41, etc.

    You will probably prefer the highest CRI you can buy, and a color
    temperature of 3000K or 3500K, though I do not know your preferences.

    There is usually no advantage to so-called "full spectrum" lamps and
    they are often less efficient and more expensive.
  7. JM

    JM Guest


    There is a relation between extended close work (such as stareing at computer
    monitors all day) and eye strain. The eye has to focus inward at close
    objects, and holding the focus there for long periods isn't easy.

    This is also the very common, but not so well known cause of nearsightedness.
    It is very stressfull to hold the focus inwards for a very long time, so the
    eye actually adapts itself by elongating so that it can view close objects
    without any focusing effort. And then your eye doctor gives you
    glasses/contacts which when worn for close work undoes the adapation, and
    your eyes have to adapt all over again by elongating some more. The process
    repeats. The glasses get thicker.

    Some things you can do to releave the strain are; 1) People with normal
    vision can wear reading glasses to reduce the focusing effort required by the
    eye, and even as a nearsightedness prevention. 2) People that are already
    moderatly nearsighted can simply remove the glasses/contacts when doing any
    extended close work. 3) People that are badly or severly nearsighted can
    purchace a weaker prescription (approx. 2-3 diopters weaker) glasses or
    contacts that are to be used for any extended close work. The weakness
    depends on how far you sit from the monitor or close work so that the eye can
    view the close objects without any focusing effort.

    On the lighting side of things, it's always a good idea to get rid of the
    34w/CW lamps. Talk to your boss or maintenance guy to install 3,000k lamps,
    preferably ones that are 40w. Also, offices tend to be lit brightly.
    Sometimes simply delamping two of the four lamps in each fixture helps.
  8. Jeff Kish

    Jeff Kish Guest

    Man, these are expensive enought! (18 - 25/bulb).

    Jeff Kish
  9. If you want to work more comfortably, then buying your own LCD monitor
    might be something to consider. Just because it's "work" doesn't mean
    you shouldn't make it more pleasant.
  10. The T8 versions are much less expensive and also more efficient.
    Suggest to your employer that he upgrade the fixtures to high CRI T8
    lamps with electronic ballasts.
  11. Jeff Kish

    Jeff Kish Guest

    It is out of my price range. Thanks anyway.
    Jeff Kish
  12. Jeff Kish

    Jeff Kish Guest

    Thanks. but they won't fly for that..
    Jeff Kish
  13. Jeff Kish

    Jeff Kish Guest

    Well, I wear contacts for multiple reasons, and my optician already knows I
    stare at a computer all day. Maybe part of the problem is I need to be able to
    see well outside of the office also.

    My guess is that a wide screen a long ways away would be the best help, but
    that is not in my budget either.

    Jeff Kish
  14. JM

    JM Guest


    "T8 versions are much less expensive" isn't necesserly true anymore. Prices
    on T12's have come down greatly since the EPACT disaster.

    On last pirce check of GE lamps.

    F34T12/CW $1.21

    F40T12/SP41 $2.01
    F32T8/SP41 $2.48
  15. TKM

    TKM Guest

    As you've probably guessed by now, the answer to your problem is not just
    changing one fluorescent tube for another and a good solution will cost more
    than a few dollars no matter what you do.

    So, do those in charge at your office respond to saving money or improving
    productivity? If you were visually more comfortable could you do more work
    or would you stay at your computer 15 minutes longer each day. Convert that
    to dollars and maybe someone will listen.

    Terry McGowan
  16. What EPACT disaster? I believe EPACT has had a rather positive impact
    on reducing energy consumption in the US.
    I meant much less expensive than the prices you quoted for T12 SP
    lamps in your earlier message.
  17. JM

    JM Guest

    T12's are cheap once again, America's energy consumpion is still going up and
    up. The oly real thing I praise EPACT for is getting rid 150w flood lamps.
    It was very common to see 150w flood lamps being installed in homes. Today,
    65w in homes and businesses are common, and even some cfls, big improvement.

    Must not have been my message. I do occassionally quote prices for
    residential lights, such as GE's "Kitchen and bath ultra" at $3 to $4 each.
    But these are SPX phosphors, though.
  18. Guest

    Hi there
  19. Guest


    Check out
  20. Ingo Thies

    Ingo Thies Guest

    Beside this there are also tools to reduce the color temperature of the
    computer screen automatically after sunset (or even at daytime). For Mac
    and Windows it is F.flux (proprietary freeware), for GNU/Linux it is
    Redshift (open source; don't mix up with the astronomical tool
    Redshift). However, reducing the color temperature below about 5000 K
    may also reduce color rendering, so it may not suitable for
    (photo)graphical work.

    Best wishes,

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