How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Martin Your Own Question

Martin
Martin, Engineer
Category: General
Satisfied Customers: 4204
Experience:  i'm 41 and i never stopped studying and experimenting
14666028
Type Your Question Here...
Martin is online now
A new question is answered every 9 seconds

Hello I need to know the optimal level of light required

Resolved Question:

Hello:
I need to know the optimal level of light required in "lux" for growing algae indoors.
There is no category listed for this and it is an unusual request....
Submitted: 4 years ago.
Category: General
Expert:  Martin replied 4 years ago.
Hello, welcome to Just Answer. There is lot of species of algae, they all have different requirements (some like to float on water surface and have full light but those used to grow under deep water can get damaged with too much exposition to bright light).



Usually algae's have 10 time more light in indirect outdoor sun (25,000 lux) than they need meaning they should be fine at 2500 lux. The intensity is not the only factor, the light frequency (it's colors) can play an important role depending of the size of the photosynthesis pigment the algae use.

Edited by Martin on 10/18/2010 at 8:36 PM EST
Customer: replied 4 years ago.
Do you have any information about grow lights or bulbs that would be the preferred choice
for any specific type of algae?
As you are an engineer, is lighting your field of expertise.....?
I will accept any answer you provide to this, as my primary question, regarding lux level
is now covered.
Expert:  Martin replied 4 years ago.
Laser, lighting and lot of things related to light are indeed part of electrical engineering curriculum. If you want to learn more about growing them, i direct you to this FAO document.



It's easier to grow them than many plants. I would prefer fluorescent tube because as they need a good photo-period (around 18 hour) those fluorescent tube are more cost effective and reliable. If you grow the kind that float in a solution instead of those attached to the ground, you can reduce the light requirement by agitating them in the water so that they all get the chance to get light (or else they will get less light after each bloom and shade each others).



You can check the Sylvania "gro-lux" tubes. At 36W-40W they give you 2500 lux at about the optimal light frequencies.

Edited by Martin on 10/18/2010 at 9:59 PM EST
Martin, Engineer
Category: General
Satisfied Customers: 4204
Experience: i'm 41 and i never stopped studying and experimenting
Martin and 118 other General Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    21775
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    21775
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/lyeung1/2010-07-25_032152_tn_IMG_0241.JPG Dr. Y.'s Avatar

    Dr. Y.

    Urologist

    Satisfied Customers:

    18778
    I am fellowship trained specializing in general urology and reconstructive urology.
  • http://ww2.justanswer.com/uploads/docjohn174/2008-12-13_170143_johnask.jpg John's Avatar

    John

    Home Appliance Technician

    Satisfied Customers:

    13453
    Appliance repair business owner for over 43 years.
  • http://ww2.justanswer.com/uploads/MU/multistatelaw/2011-11-27_173951_Tinaglamourshotworkglow102011.64x64.jpg Tina's Avatar

    Tina

    Lawyer

    Satisfied Customers:

    8681
    JD, BBA Over 25 years legal and business experience.
  • http://ww2.justanswer.com/uploads/dermdoc19/2010-09-30_160749_Photo_122807_015.JPG dermdoc19's Avatar

    dermdoc19

    Dermatologist

    Satisfied Customers:

    3945
    30 years practice in general and cosmetic dermatology
  • http://ww2.justanswer.com/uploads/BI/birddoctor/2012-6-22_173214_birddoctor.64x64.png Dr. Pat's Avatar

    Dr. Pat

    Bird Veterinarian

    Satisfied Customers:

    3463
    25+ years working primarily or exclusively with birds
  • http://ww2.justanswer.com/uploads/RY/rydergar/2012-6-6_192240_IMG0328.64x64.JPG Dr. Gary's Avatar

    Dr. Gary

    Cat Veterinarian

    Satisfied Customers:

    3421
    DVM, Emergency Veterinarian, BS (Physiology)
 
 
 
Chat Now With An Expert
Martin
Martin
Electrical engineer
633 Satisfied Customers
i'm 41 and i never stopped studying and experimenting