HOPELESS GROWER IN NEED OF EXPERT HELP PLEASE

Hi there im trying to grow with a 600 w sodium bulb in plagron soil royalty 50.
I started germinating my seeds 4 weeks ago and they have been under light for 3 of them weeks. they now have very bright yellow leaf tips and dark green in the middle. Any ideas what this could be?
Thanks for your time help would be gratefully recieved

its a sign of wilting.. your babies are dying!! move the bulb away from the plants.. sounds like ur burning them.

It really takes more skill to grow a seedling under a 600 watt bulb than it takes to raise an entire crop.. Make life easy on yourself and get ANY light besides a 600 watt HPS (40 watt flor preferably - 5.00 at Hardware store)

Curious, how close is the light to your plant?

How do you grow a 600w sodium bulb in Plagron soil?.. just kidding ;)
Gardenknowm is right, one fluoro tube will work wonders for seedlings for small grow,
once standing with 4-5 nodes, shoot the big light to them, start about 30" away and move closer 6-9" every 3 days or so until you really see'em perk up, then keep light at that distance...watch them, if the tips turn up and burn, back the light off..your plants will always tell you if they feel good>>>hope this helps latewood :)

hi it is a meter above them they are about 6 inches high

thanks mate ill give that a try

I would try to pick up fluoros (low heat) so you can get light right on top of them. at least until they get more resistent to the heat.imho, but you can manage them with your 600, just keep an eye on them. What is your room temp...please convert.

You didn't give your plants fertilizer before 3 weeks of growing right? Fertilizer will cause burning in the leaves.

varies between 24-35 or 78-95 i ave just got an air conditioner and a dehidifier to stabilse it at arond 26 83 is this right mate
ps thanks for your help it is nice people take there own timeto help hopeless growers like myself

I hate to say it Cam but i gave them some fertiliser I read somewere that you should top the soil up so it gives it a bit of revival and dont drain the soil completely of its nutrients.I have read so many books and growing tips my head is spinning.SHOULD I FLOOD THE SOIL ITH FRESH PH ONLY WATER. tHANKS FOR YOUR HELP MATE GRATELLY APPRECIATED CHEERS sorry forgot to turn caps lock off lol