enviror light are just a flat CPf thats all and the net is the normal watts I think its 18 watts.
Watts is watts and thats it when it comes to cpf.
Now normal tube florsents the exposed bulb to the plant is greater do to disign.
A fulll service ballast (not wattsavor ) a full service bulb ( not wattsavor)
You would see a better responce to use full service system.
And the bottom line , if you know what your doing is
Grams/watts/ months or 1000 grams/1000 watt bulb months If you get .5 grams per watt month you doing real good. Note time is part of the division.
Hids provide a higher output per watt of usable spectrum. Noting that if someone says Blue or red spectrum which is only part of the spectrum put out by the bulb.
If you doing it to have fun go for it, but if your doing it for product , pot. its totaly your thing.
The busted for having fun is the same as growing good size plants.