In 2017 Halogen lights were still the cheapest.  $10-$20.

LED
Most LEDs were low voltage, requiring a transformer.

120V bulb only

LED Power examples
9 Watt    50W equivalent - 700 Lumens
10 Watt - 65W equivalent - 650 Lumens
10 Watt - 60W equivalent - 800 Lumens
13 Watt - 85W equivalent - 1100 Lumens
16 Watt - 75W               800 Lumens

Halogen
 A 60-watt–equivalent halogen bulb from Philips consumes 43 watts 
         100W halogen      1545 Lumens
Light Bulb Guide - LED vs. CFL vs. Halogen - Tom's Guide

size
PAR 30  3.75 x 3.75 x 4.5

120V bulb and fixture
Most were $160-$250

LED Floodlights

Acclaim Lighting Floodlights Collection 2-Light  - The Home Depot	$33
Shop Gampak 5.3-in 1-Head LED Bronze Switch-Controlled Flood Light at Lowes.com 10W 800 Lumens $25 2.8 x 2.8 x 5 in.
New Year's Sale: Sigma Electric 14337BR 10W LED Light, Gray/Bronze | Better Homes & Gardens 10W 800 lumens Amazon $25 2.8 x 2.8 x 5.3 in.
700-lumens-e-conolight $35 4 x 4 x 4.5 in
Halogen Acclaim Lighting Floodlights Collection 2-Light - The Home Depot 100 watts each $33 Most at Lowes and Home Depot are Low Voltage In ground Well lights LED In-Ground Well Light - 8 Watt | LED Well Lights & Uplighting | LED Landscape Lighting | Super Bright LEDs
Links:
:Light bulb size reference

last updated 15 Apr 2017