I grow Auto Gold Leaf and N/Lights in a double glazed centrally heated greenhouse out in the sticks of Western Wale UK.
My question is as follows, can I use a 400 watt LED grow light on my 2 x kids who have just flowered, when its gloomy and direct daylight is in short supply also what height from the canopy of green.
I thank you.
James68 (75)
If you have a true 400 watt light, I would look at about twenty one inches From canopy . Good luck 
gold leaf one of my favorites.
can i mix sunlight and LED ?
Yes it will be fine.
Great news ! , as the weather here is about to go to hell in a handbasket for the next 2 x weeks âŚI thank you from western Britain .
How can I find out if my âinheritedâ LED is a true 400watt light ?
The instructions did not make it wtth the LED .
I Googled the heck out of what is written on it to no luck.
See below.
( szmrjk.cn 400 smd/led MRJ-400W CE Ro HS )
If I was guessing I would say it is not a true 400 watt light .I could not find info on in it. IN the future look at HLG lighting, good product. Best bang for your buck.
Cannabis plants are actually pretty tough when it comes to cold weather.
Can you show us a picture of the light.
Maybe we could tell from that.
DRsDank,
thank you for replying, enclosed are 5 x pics of the LED unit purported to be 400 watts. The .cn is the web address for China so all bets are off when it comes to being a true 400watt unit I guess.
Regards James ( it weighs a lot
Thank you for all your great input in this matter.
I shall be purchasing HLG lights as they sell them here in Britain.
Here are 5 x snaps of the weighty beast from .cn (China)
Regards
James
Iâm sure it will grow and flower a plant.
but that light will not produce solid dence buds like a quality light will.
Good luck
Theyâre ALL made in China, or at a minimum, the boards and controllers are.
But that little thing ainât no 400w light. Maybe 100w at best.
Its the same when i eat Chinese food, I am hungry one hour later.
I guess there was a reason why the owner passed it on to me being the Gomer Pyle of Pot Growing.
Many thanks for your fine Karmic advice, its HLG lighting for this boy !
Thanks for your replyâŚIts HLG lighting for this boy ! 
Lol! I have a diploma from the School for the Mechanically Disinclined. And if Jim Nabors and Rock Hudson had a son, they wouldâve named him Rock Pyle.
Are they economical to use as electricity cost a shed load here in Wales ?
I really admire your gardening skills and I draw inspiration from what I see in your post.
Om Dude !
Absolutely. LEDs use a fraction of the electricity compared to âold schoolâ grow lights. Appreciate the compliments, although I still consider myself more novice than expert.
I like itâŚwill likely steal it for the future.
Hi
in the event of power outages, which we get a many, how long can a grow last before starting to degrade/ die ?
The winter storms have come very early here and the juice went off in the last 5 mins of The Sopranos last night at 11..55pm and has just come back on.
It was nice having a few pipes by candlelight but it made me think about LEDâs and electricity.
Regards
