Seedlings under 400W HPS?

[bazzae123]

Hi Guys,

What distance would you recommend having my seedlings under a 400W HPS? My 4 seedlings are 2 days old and the highest one is just under 4.5 cm hight with the inner serrated leaves still smaller than the 2 round ended. The lamp is 1.2 M above the seedlings with a temperature of 77oF at ground zero. I don't want the seedlings to stretch so does the current setup and hight sound OK, or should I replace the HPS with a CFL until the seedlings are more established and can handle the HPS at a lower height?

Baz

[Nochowderforyou]

Use CFL's instead of the HPS for now. HPS light is far too intense for young seedlings, and you could risk burning them up.

[stinkyattic]

The redder spectrum from the HPS can play a part in promoting male sexual expression. You want a light on the bluer end, such as a CFL, cool white flouro tube, of MH.

[Dutch Pimp]

I get lost, as soon as the metrics start.