Monorail Track Lighting

For light bulbs, is a 125 lumen XENON bulb more bright or 250 CREE LED bulb brighter? Which one would u get?

Should you over volt a LED mr16 bulb like a halogen bulb...? I know alot of people over volt 12v mr16 halogen bulbs to 14.4 to give them more white light rather than yellow, but what about a 12v mr16 LED bulb would you want to run that at 14.4 volts or could you get a clear bright white light out of it by running it at 12volts. Also same question about the Cree XLamp XR-E LED Bulb - 12V AC/DC, MR16 Base.

Why is this thing only $17? Its 500 Lumen flash light off ebay from a United States seller? Tell me what you think about this. At a sams club they selling a 200lumen for $29.. this is a 500 for $17 http://cgi.ebay.com/CREE-LED-Lamp-500-Lumens-Flashlight-Torch-14500-Charger-/280621693020?pt=US_Flashlights&hash=item41565b385c Maybe but see they are selling 10 of them

par38 reef light question? i have a 24 gallon aquapod, with 18" nova extreme t5 light. i want to keep sps and clams. how many par38s should i get for my tank? would one work along with the t5ho lights? heres the link to the light i want to get http://www.ledpacific.com/products/Pacific-14000K-CREE-LED-SPS-Bulb%2C--Par38%2C-ES-27-or-ES26-Screw-Fitting.html

High Efficiency IR LEDs? A lot of work has gone into making the blue power LED more efficient so white-light diodes can be more efficient. With white-light LEDs producing more than 200 lm/w (Cree) at power levels of 1W the basic efficiency of the blue LED is over 50%... My question is: does anyone know of an InfraRed LED manufacture that markets a ~1w IR LED that has greater than 10% efficiency?