The equivalency is in lumens, a measure of light emitted. (Lumens aren't necessarily what a plant sees. PAR is more accurate for that. It's what we see.). Lux (lumens falling on a location) is a better measurement to compare, say, a CFL in a reflector to a CFL floodlight with built-in reflector. Their packaging would indicate different lumens because one reflects and one doesn't. The only way you could compare them is measuring lux using a free smartphone app like BeeCam Light Meter.hey everybody. It has been brought to my attention that CFL wattage equivalents might not be good. As in a CFL bulb that only uses 14 watts but is equivalent. To 60.
My only defense of CFLs (And I feel obligated to defend them slightly since my first grow was using them and was remarkably successful for a first grow) is that even at $8 a pop those Cree bulbs are still pretty pricey compared to CFL, just in the sense that a 9.5w Cree bulb puts out about 650 Lumens (As listed by them, and yes I know Lumens aren't everything, but just bear with me) putting those Cree bulbs at $0.0123/Lumen. Whereas with CFL, for $7 you can get a 40w ("150w Equivalent") CFL which puts out 2600 Lumens, putting it at $0.0027/Lumen. To put it another way, with Cree LED bulbs, $1 gets you 81 Lumens, and with CFL $1 gets you 370 Lumens. Granted, the Cree bulbs will last longer, and give slightly better Lumens per Watt (68.4 for Cree LED vs 65 for CFL), but as it stands they don't really put the nail in the coffin of that particular debate just yet, IMO.The equivalency is in lumens, a measure of light emitted. (Lumens aren't necessarily what a plant sees. PAR is more accurate for that. It's what we see.). Lux (lumens falling on a location) is a better measurement to compare, say, a CFL in a reflector to a CFL floodlight with built-in reflector. Their packaging would indicate different lumens because one reflects and one doesn't. The only way you could compare them is measuring lux using a free smartphone app like BeeCam Light Meter.
I'm not sure why anyone would use CFL today when Cree LED screw-in lightbulbs are sold at Home Depot. A 60w equivalent uses 9.5w, has a 10-year warranty and costs $8. See this journal page (<<link) for more information and a link to CaptainMorgan's thread where I believe they began to be used.
+1I first started growing with CFL's using the equivalent of 700 watts. I had bulbs hanging everywhere. I got 3 4 good grows then I switched to a 400 watt MH/HPS and to tell you the truth they work just about the same. I may get a bit more bud but it's all good. CFL's work just fine if you use enough.