How Far to Keep Light From Plant... Pics Included in the
The Grow Room forums; Hey RIU... I started my new grow and i wanted to know how far should i keep my 400W MH ...
How Far to Keep Light From Plant... Pics Included
Hey RIU... I started my new grow and i wanted to know how far should i keep my 400W MH light from my seedlings. They just popped up, and right now i have the light about 2 feet about them, just enought so they have a nice warmth on them. is this too close. Thanks in adavance, RickRolled
If you have a light meter, I have read in Jorge Cervantes marijuana Grower's Bible that seedlings/clones/babies should only have 375 foot candles maximum. I'm not sure how accurate that statement is, but I do know that the small ones need less light, so I'd watch yours carefully. You can pickup a digital light meter in town from hardware or electrical stores. Look for one that can measure a large number of foot candles, > 10,000 or > 20,000 if possible. I picked up an Extech that does 40,000 foot candles for about $180. I'm sure there are many cheaper ones available. Hope this info helps you somewhat..
I would not have an HPS on those to begin with.
Originally Posted by Baby Dick Loser
Do not place hid lamps over new clones, cuttings or seedlings. You'll kill em or severely damage them. I use 6500k fluorescents in 2 shop lights hung on yo yo hangers for a total of 4 bulbs for the plant's first 2 weeks. then go into veg with at least 4 hours of darkness each night for the first week before cranking on the nutes and 24 lighting.
OK so i strung up some CFL's 4 23W (100 watt equivent). Are they getting enought light now?. Thanks for the help +rep all above
looks good, im sorry but i cant agree with people saying to not put seedlings under hps, they grow outdoors with the sun that is muchhhh stronger with no issue, ppl are a little too anal sometimes
Looks great man! I know you won't have a problem with using those 4 CFL bulbs for the first 2-4 weeks. Here's what I'd do, granted I'm relatively new, but I'm keep them under the CFL's as you have them now for 2 weeks. Assuming they look healthy and are doing well, I'd move them to the EDGE of your 400w HPS lamp...NOT directly under, more like on the outskirts/side/edge off the main light underneath the reflector. Keep an eye on them there closely. Keep them there a week. Move them closer. Repeat. Just keep an eye on them. If they get leggy/stretchy, use more light. If they get heat stress or a burn, use less light. Ramp it up slowly.
Originally Posted by RickRolled
Hope this helps..
i was wondering this same thing but with cfls..how far away should you keep 26watt cfls from 1-2week old plants?? is less than a foot to close?? like 6inches?
Its not that we are little too anal its that in the early stages of a plants life care must be taken to not introduce them to too much heat or too much intense light.
Originally Posted by diamonddave
It is not impossible to get seedlings to grow under HPS but using CFL's means you can concentrate on creating a thriving root zone before getting them under HPS.
Most people dont raise their lights up high enough using HPS when trying to grow seedlings underneath them and generally cook them due to too much heat.
I personally use 24w 6400K T5 for 10days and then
200w ECO CFL for a further 10-15days then
under my 600w HPS.
Like i mentioned its not impossible to do but most dont raise their lights high enough and if they do then the seedlings can stretch for more light if you arent carefull which is why alot of people opt for CFL's to get them stared.
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