Too much light

I’ve got two 1,000-watt HIDs in an area of 24 square feet. Is 290,000 lumens in 186 cubic feet (or 83 watts per square foot) too much light? Is there such thing as too much light? Is this safe for the plants?
Daniel A,
Alhambra, California

The plants can use the light providing they get enough nutrients, water and CO2. The plants are getting more light than they normally would indoors. This increases their rate of photosynthesis and their growth rate, so they require more nutrients. CO2, a gas found in the air, is used as an ingredient by plants in photosynthesis. With intense light, CO2 will become a limiting factor unless it is supplemented using a CO2 tank and regulator. About 350 parts per million (ppm) of CO2 is found in the air. In an active garden with little ventilation, it is quickly used up and photosynthesis is suspended. By enriching the air to 2,000 ppm CO2, photosynthesis will be supercharged and plant growth increases.

Another problem that you might face is excess heat. Using air-cooled light reflectors prevents heat from getting into the space. These reflectors are cooled by a stream of cool outside air.

Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA. You can also email Ed at [email protected], and send queries via his websites at All featured questions will be rewarded with a copy of Ed’s new book, Best of Ask Ed: Your Marijuana Questions Answered. Sorry, Ed cannot send personal replies to your questions.



  1. Pingback: air jordans

  2. Pingback: best clinic for piles

  3. Pingback: watch porn google

  4. Pingback: peppa pig

  5. Pingback: breast augmentation in Houston

  6. Pingback: Make Money Online Without a Website

  7. Pingback: VAGINASPLIT by Lieutenant Fokofiev

  8. Pingback: commercial air conditioner installation Montclair CA

  9. Pingback: Self Storage Units and Facilities in Lauderdale Manors

  10. Pingback: Watch movie for free

  11. Pingback: home maker on the edge

  12. Pingback: More here

  13. Pingback: unblocking

  14. Pingback: Cooper

  15. Pingback: Self Storage Units and Facilities in Jefferson on River Road

  16. Pingback: garden bridges Los Angeles

  17. Pingback: Denver virtual staging

  18. Pingback: download movie

  19. Pingback: دانلود

  20. Pingback: download

  21. Pingback: دانلود فیلم

  22. Pingback: slot machines

  23. Pingback: 12 month loans direct lenders only uk

  24. Pingback: karajupvc

  25. Pingback: Seo

  26. Pingback: صيانه

  27. Pingback: unique

  28. Pingback: video blog

  29. Pingback: bitcoin

  30. Pingback: body shaper malaysia

  31. Pingback: activewear

  32. Pingback:

  33. Pingback: eestbound type beat

  34. Pingback: Finger Family Song

  35. Pingback: charts all over the world

  36. Pingback: garden bridges

  37. Pingback: emergency plumber

  38. Pingback: karaj

  39. Pingback: پنجره دوجداره

  40. Pingback: Nursery Rhymes

  41. Pingback: قیمت پنجره

  42. Pingback: پنجره

  43. Pingback: index

  44. Pingback: aarp dental insurance plan for seniors

  45. Pingback: download best

  46. Pingback: دانلود فیلم اکسیدان

  47. Pingback: دانلود فیلم

  48. Pingback: Business Networking

  49. Pingback: window

  50. Pingback: window price

  51. Pingback: دانلود

  52. Pingback: folding exercise bike

  53. Pingback: Puppies sg

  54. Pingback:

  55. Pingback: mass mailing

  56. Pingback:

  57. Pingback: domino qq99

  58. Pingback:

  59. Pingback: game tembak ikan deposit 25 rb

  60. Pingback: garden bridges los angeles

  61. Pingback: Mitch McConnell

  62. Pingback: Cyber Security Training Online

  63. Pingback: viagra

  64. Pingback: places to buy weed online

  65. Pingback: SEO Sheffield

  66. Pingback: IELTS exam in Karachi

  67. Pingback: پنجره

  68. Pingback: IELTS institute in Karachi

  69. Pingback: اموزش ساخت پنجره دوجداره

  70. Pingback:

  71. Pingback: فروش توری پنجره دوجداره

  72. Pingback: پنجره

  73. Pingback: پنجره دوجداره

  74. Pingback: دانلود

  75. Pingback: پنجره دوجداره

  76. Pingback: پنجره دوجداره

  77. Pingback: авто-ключар

  78. Pingback: upvc

  79. Pingback: how to buy bitcoins

  80. Pingback: پنجره

  81. Pingback: دانلود فیلم ایرانی

  82. Pingback: پنجره

  83. Pingback: background checks

  84. Pingback: دانلود فیلم های روز

  85. Pingback: sell home

  86. Pingback: finger family

  87. Pingback: guaranteed approval loans

  88. Pingback: Vancouver BC airport shuttle Northstarlimos

  89. Pingback: reussir

  90. Pingback: free shipping

  91. Pingback: sports

  92. Pingback: los angeles bachelor party strippers

  93. Pingback: Pig Toys

  94. Pingback: Tile and Grout Cleaning Killeen TX

  95. Pingback: Kompaktkamera günstig

  96. Pingback: mixtape hosting packages

  97. Pingback: فروش توری پنجره

  98. Pingback: دانلود

  99. Pingback: toddlers

  100. Pingback: دانلود

  101. Pingback: پنجره ضد سرقت ایرانی

  102. Pingback: engine repair shop

  103. Pingback:

  104. Pingback:

  105. Pingback: 3D, monster truck

  106. Pingback: دانلود قسمت دوم سریال عالیجناب

  107. Pingback: دانلود سریال عالیجناب قسمت اول 1

  108. Pingback: دانلود فیلم ایرانی

  109. Pingback: relations

  110. Pingback: دانلود فیلم

  111. Pingback: Carolina

  112. Pingback: Women's

  113. Pingback: 16 دانلود سریال شهرزاد

  114. Pingback: Get the facts

  115. Pingback: 16 دانلود شهرزاد

  116. Pingback: for kids

  117. Pingback: Social Media Marketing

  118. Pingback:

  119. Pingback: casino online

  120. Pingback: zobacz

  121. Pingback: Strasbourg tourist guide

  122. Pingback: دانلود شهرزاد قسمت 13

  123. Pingback: دانلود شهرزاد قسمت 15

  124. Pingback: دانلود شهرزاد قسمت 15 پانزده

  125. Pingback: پنجره

  126. Pingback: کول دانلول

  127. Pingback: anime

  128. Pingback: vpm

  129. Pingback: دانلود قسمت هشتم شهرزاد

  130. Pingback: vigra master � bom

  131. Pingback: cliquez l�

  132. Pingback: coin-banks

  133. Pingback: coin-banks

  134. Pingback: Porn World

  135. Pingback: bitcoin investment coin-banks

  136. Pingback: coin-banks trading

  137. Pingback: coin-banks bitcoin

  138. Pingback: magazin de pescuit

  139. Pingback: bitcoin hft

  140. Pingback: Situs Qiu Qiu 99 Poker Online Indonesia

  141. Pingback: led lights

  142. Pingback: پنجره

  143. Pingback: clash royale generator

  144. Pingback: jake burgess berlin ct

  145. Pingback: zynga poker chips

  146. Pingback: Gaming blog

  147. Pingback: Roof Repair Long Island

  148. Pingback: ejaculate

  149. Pingback: دانلود قسمت پنجم شهرزاد دوم

  150. Pingback: دانلود قسمت ششم شهرزاد

  151. Pingback: پنجره دوجداره

  152. Pingback: فروش توری پنجره دوجداره

  153. Pingback: Facial Spa Services Lauderhill

  154. Pingback: Facial Spa Services Coconut Creek

  155. Pingback: Facial Spa Services Pompano Beach

  156. Pingback: Acne Facial Treatments Lauderdale-by-the-Sea

  157. Pingback: Facial Spa Services Lighthouse Point

  158. Pingback: Facial Spa Services Sunrise

  159. Pingback: love compatibility with taurus

  160. Pingback: دانلود سریال عاشقانه

  161. Pingback: قیمت پنجره دوجداره در ایران

  162. Pingback: شرکت تولیدی پنجره

  163. Pingback: پنجره ضد سرقت ترک

  164. Pingback: porno gratis

  165. Pingback: videos porno

  166. Pingback: porno gratis

  167. Pingback: porno gratis

  168. Pingback: porno

  169. Pingback: videos porno

  170. Pingback: videos porno

  171. Pingback: porno

  172. Pingback: porno gratis

  173. Pingback: porno

  174. Pingback: porno gratis

  175. Pingback: videos porno

  176. Pingback: Lindsay

  177. Pingback: videos porno

  178. Pingback: how to bypass windows 7 password

  179. Pingback: دانلود قسمت سوم شهرزاد دوم

  180. Pingback: دانلود قسمت دوازدهم عاشقانه

  181. Pingback: Loyola College for Sale

  182. Pingback: Hundeskove i Nordjylland

  183. Pingback: دانلود قسمت 12 عاشقانه

  184. Pingback: پنجره

  185. Pingback: Indirect

  186. Pingback: lesbian porn

  187. Pingback: Dillion Harper

  188. Pingback: دانلود شهرزاد قسمت هفتم فصل دوم

  189. Pingback: hampton bay ceiling fan blog

  190. Pingback: Kitty Catherine

  191. Pingback: Nicole Aniston

  192. Pingback: دانلود شهرزاد قسمت هشتم فصل دوم

  193. Pingback: دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2 دوم 2aaadffdsvc

  194. Pingback: stop drinking beer

  195. Pingback: دانلود رایگان قسمت 8 هشتم سریال شهرزاد فصل دوم 2

  196. Pingback: cm54xtcn5wyxjcmt5neywtfasdw4cet